The Cesario Codex

Bespoke Blueprint

Your complete guide to custom shirtmaking. From measuring your body to choosing your signature style.

Neck & Collar

Neck Size

Wrap the tape around the base of the neck where the collar sits, just above the collarbone. Keep the tape snug but insert two fingers between the tape and skin. Read the measurement where the tape overlaps. Measure in a relaxed standing position with the head facing forward.

The two-finger rule accounts for collar shrinkage and day-to-day swelling

Neck sizes typically range from 14" to 19" for men, 12" to 17" for women

If between sizes, always round up to the next half inch

Measure at the end of the day when the neck is at its widest due to normal swelling

Measuring too tight without the two-finger gap, resulting in a collar that chokes

Tilting the head down which bunches the neck skin and adds false circumference

Measuring over an existing shirt collar instead of bare skin

Letting the tape ride up to the Adam's apple instead of staying at the collar base

Neck size directly determines collar circumference. A collar that is even a quarter inch too tight will cause visible pulling at the top button and create discomfort throughout the day. Too loose and the collar gaps away from the neck under a tie, creating a sloppy appearance.

Chest & Torso

Chest

Measure around the fullest part of the chest or bust, typically at the widest point. Pass the tape under the arms and across the shoulder blades in back. The tape should be level all the way around and snug but not compressing. Arms should hang naturally at the sides, not lifted or pulled back. For women, measure over the fullest point of the bust while wearing a well-fitting bra.

Typical chest measurements range from 36" to 52" for men, 32" to 48" for women

If the client has a prominent belly, take both chest and stomach measurements and use the larger

For muscular builds, ensure the tape sits on top of the pecs, not below them

Have the client stand naturally; posture dramatically affects this measurement

Puffing out the chest or taking a deep breath during measurement

Letting the tape droop in back below the shoulder blades

Measuring over a thick sweater or jacket

Pulling the tape too tight which compresses soft tissue and gives a false reading

The chest measurement is the primary driver of the shirt's overall width through the torso. Too tight and the shirt pulls at the buttons creating horizontal stress lines. Too loose and the excess fabric billows out, particularly noticeable when the shirt is tucked.

Waist

Locate the natural waist, which is the narrowest point of the torso, usually about an inch above the navel. Wrap the tape around this point keeping it level and parallel to the floor. The tape should be snug against the skin without compressing. Have the client breathe normally and measure on an exhale.

Ask the client to bend sideways to find the natural crease point; that is the natural waist

The difference between chest and waist determines the taper of the shirt

A 6" or greater drop from chest to waist indicates a strong taper is appropriate

For athletic builds, the waist-to-chest ratio drives whether a superfit or fit profile works best

Measuring at the belt line instead of the natural waist, which is typically higher

Sucking in the stomach during measurement

Confusing trouser waist with natural waist; trouser waist sits 2-3 inches lower

Measuring over a belt or thick waistband

The waist measurement determines how much the shirt tapers from the chest. Getting this right eliminates billowing fabric at the sides when tucked. A well-tapered shirt follows the body's natural contour from the chest through the waist without feeling restrictive.

Hip / Seat

Measure around the widest point of the hips and seat, typically about 7-8 inches below the natural waist. The tape should be level and pass over the fullest part of the buttocks. Stand with feet together and weight evenly distributed.

This measurement is critical for tucked shirts; the hem must pass over the hips to stay put

For clients who primarily wear shirts tucked, the hip measurement matters more than they think

Hip measurement is often 2-4 inches larger than waist for men, 6-10 inches for women

If hips are wider than chest, the shirt body must accommodate this or it will constantly untuck

Measuring too high at the waist instead of the actual widest hip point

Not accounting for items in pockets which add bulk

Ignoring this measurement entirely, leading to shirts that ride up when tucked

Measuring with legs spread apart which flattens the seat

The hip measurement affects how the shirt sits when tucked. If the shirt is too narrow through the hips, it will pull free from the trousers throughout the day. The hem circumference must clear the hips with enough ease to allow natural movement without untucking.

Across Chest

Measure across the front of the chest from the crease of one armpit to the other, keeping the tape straight and level. The tape should sit about 2 inches below the collarbone across the upper chest. Arms should be relaxed at the sides.

This measurement is typically about half the full chest circumference minus 1-2 inches

Across chest dictates how wide the front panel of the shirt will be

For muscular clients with prominent pecs, add 0.5" of ease to prevent pulling

This measurement directly affects button gap; if too tight, buttons will pull open

Measuring too low across the nipple line instead of the upper chest between the armholes

Measuring from shoulder seam to shoulder seam instead of armpit crease to armpit crease

Having the client cross their arms or hunch forward during measurement

Confusing across chest with the full chest circumference

Across chest determines the width of the front panels. Too narrow and the shirt pulls across the chest with visible stress at the buttons. Too wide and the armhole seams fall onto the arms, restricting movement and creating excess fabric under the arms.

Across Back

Measure across the back from the crease of one armpit to the other, keeping the tape straight and level across the shoulder blades. This measurement should be taken about 4 inches below the base of the neck. The client should stand relaxed with arms naturally at the sides.

Across back is typically 0.5" to 1" wider than across chest for most builds

This measurement is especially important for clients who sit at desks all day

For clients with rounded or forward-hunched shoulders, add 0.5" ease

The difference between across chest and across back helps determine whether the shirt needs a forward shoulder rotation

Measuring while the client has their arms crossed or reaching forward

Placing the tape too high across the neck instead of mid-shoulder-blade level

Not distinguishing across back from yoke width; across back is lower and usually wider

Compressing the shoulder blades by pressing the tape too firmly

Across back controls the width of the back panel. If too narrow, the shirt pulls tight across the shoulder blades when reaching forward, restricting movement. If too wide, the excess fabric creates unsightly horizontal wrinkles across the mid-back.

Shoulders & Yoke

Yoke Width

Measure straight across the back from the tip of one shoulder bone (acromion) to the other. The tape should pass just below the base of the neck across the upper back. Keep the tape flat against the back, not draped over rounded shoulders. The client should stand relaxed with arms at their sides.

The yoke sets the entire structure of the shirt; it is the foundation from which everything hangs

Typical yoke widths range from 16" to 20" for men, 14" to 18" for women

Feel for the bony tip of the acromion on each side; that is your endpoint

A yoke that is too wide causes the shoulder seam to droop down onto the upper arm

Measuring too wide by going past the shoulder bone onto the deltoid muscle

Measuring too narrow by stopping at the neck-shoulder junction instead of the shoulder tip

Letting the tape sag or curve over rounded shoulders

Having the client shrug their shoulders which artificially narrows the measurement

The yoke is the single most important structural measurement. It determines where the shoulder seam sits, how the sleeves hang, and how the shirt drapes across the upper body. An incorrect yoke makes the entire shirt look wrong regardless of how perfect every other measurement is.

Yoke Depth

Measure the vertical distance from the top of the shoulder seam (where the collar meets the shoulder) straight down to where you want the yoke seam to sit on the upper back. This is typically 3 to 4.5 inches below the shoulder line. Measure on the back, centered between the shoulder blades.

Standard yoke depth is around 3.5" for most builds

A deeper yoke (4"+) can accommodate rounded or sloped shoulders

A shallower yoke (3") works for square-shouldered clients and gives a sportier look

Yoke depth interacts with sleeve head height; changing one affects the other

Confusing yoke depth with the full back length measurement

Measuring on an angle instead of straight down vertically

Setting the yoke seam too low which limits arm mobility

Not considering the client's shoulder slope when determining depth

Yoke depth controls how much fabric sits between the collar and the back panel seam. It affects the shirt's drape over the shoulder blades and works in conjunction with yoke width to set overall upper body fit. Too deep and the yoke seam rides low; too shallow and it sits high and tight.

Left Front Shoulder Slope

Measure the vertical drop from the base of the neck at the shoulder junction straight down to the tip of the shoulder bone (acromion). Place the end of the tape at the point where the neck meets the shoulder and measure the vertical drop to the shoulder tip. This captures the natural slope or angle of the shoulder.

Standard shoulder slope is about 2" to 2.5" of vertical drop for men, 2.5" to 3" for women

Square shoulders have a slope of 1.5" or less; very sloped shoulders drop 3" to 3.5"

Slope asymmetry is extremely common; most people have one shoulder slightly lower

The dominant arm side often has a slightly higher shoulder due to muscle development

Measuring the diagonal distance instead of the vertical drop

Starting the measurement at the top of the shoulder instead of the neck-shoulder junction

Not having the client stand naturally; squared shoulders give a false reading

Measuring both sides once and averaging instead of recording each independently

Shoulder slope determines how the shirt fabric drapes from the neck to the shoulder point. If the pattern slope does not match the body, the fabric will either bunch at the shoulder point (pattern too sloped) or pull diagonally from the neck creating drag lines (pattern not sloped enough).

Right Front Shoulder Slope

Measure the vertical drop from the base of the neck at the shoulder junction straight down to the tip of the right shoulder bone (acromion). Use the same technique as the left side. Compare both readings to identify any natural asymmetry.

Asymmetry of 0.25" to 0.5" is normal and should be noted on the pattern

Clients who carry bags on one shoulder often have a measurable difference between sides

If asymmetry exceeds 0.75", the pattern should include individual adjustments per side

Shoulder slope works in conjunction with yoke depth to set the armhole position

Assuming symmetry with the left side without actually measuring

Measuring the diagonal slope line instead of the vertical drop

Letting the client lean or shift weight to one side during measurement

Not recording asymmetry when it exists; even 0.25" makes a visible difference

Individual shoulder slope measurements per side allow the shirt to drape evenly across both shoulders despite natural body asymmetry. This prevents the common issue of a shirt that fits well on one shoulder but pulls or bunches on the other, which is impossible to fix without side-specific slope adjustments.

Arms & Sleeves

Left Sleeve Length

Measure from the center back of the neck (the vertebra that protrudes at the base of the neck) across the shoulder, down the outside of the arm to the mid-wrist bone. The arm should be slightly bent at about a 15-degree angle with the hand relaxed. To get the actual arm-only length, subtract half the yoke width from this measurement.

Standard sleeve lengths range from 32" to 37" measured from center back neck

The slight elbow bend accounts for the natural arm position when wearing the shirt

If the client wears a watch, measure on the watch-wearing wrist to the edge of the watch

Left and right sleeve lengths often differ by 0.25" to 0.5" due to dominant arm use

Measuring with the arm fully extended, which gives a measurement that is too long

Starting the measurement at the shoulder point instead of center back neck

Measuring to the fingertips or hand instead of the wrist bone

Not accounting for the slight bend at the elbow

Sleeve length is one of the most visible fit indicators. A properly fitted sleeve shows about 0.5" of cuff below the jacket sleeve. Too short and the cuffs disappear inside the jacket. Too long and the cuffs bunch up around the hands, looking sloppy and getting in the way.

Right Sleeve Length

Always measure both sleeves independently; asymmetry is normal and expected

The dominant arm is often 0.25" to 0.5" longer due to muscle development

If the difference between arms exceeds 0.75", it should be noted prominently on the order

A proper sleeve measurement ensures the cuff hits exactly at the wrist bone

Assuming both arms are the same length and only measuring one side

Measuring with the arm fully extended straight out

Starting at the shoulder seam instead of center back neck

Not placing the tape over the elbow crease naturally

Matching sleeve lengths to each arm individually is a hallmark of true custom tailoring. Off-the-rack shirts use one sleeve length for both arms. Getting each sleeve right ensures both cuffs land at the perfect wrist position regardless of natural arm asymmetry.

Bicep

Measure around the fullest part of the upper arm, typically at the midpoint between the shoulder and the elbow. The arm should hang naturally at the side, relaxed and not flexed. Wrap the tape snugly without compressing the muscle.

Typical bicep circumferences range from 12" to 17" for men, 10" to 15" for women

Add 2-3 inches of ease for a comfortable sleeve that does not restrict movement

For athletic clients, the bicep is often the limiting factor in sleeve width

If the bicep is large relative to the forearm, a tapered sleeve is recommended

Having the client flex their bicep during measurement

Measuring too high near the shoulder or too low near the elbow

Pulling the tape too tight which compresses the muscle and gives a false reading

Only measuring one arm when muscle mass often differs between sides

Bicep circumference determines the upper sleeve width. Too tight and the sleeve restricts arm movement, causing the shirt to pull up at the waist when the arms are raised. Too loose and the excess fabric bunches at the armhole, creating a baggy appearance.

Forearm

Measure around the fullest part of the forearm, approximately 2-3 inches below the elbow crease. The arm should be relaxed at the side. Wrap the tape snugly without compressing.

The forearm measurement helps define the sleeve taper from bicep to cuff

Typical forearm measurements range from 10" to 14" for men, 8" to 12" for women

A well-tapered sleeve transitions smoothly from the bicep through the forearm to the cuff

For rolled-sleeve looks, the forearm measurement determines how the fabric sits when pushed up

Measuring too close to the elbow where the forearm is widest due to the joint

Measuring at the wrist instead of mid-forearm

Clenching the fist which flexes the forearm muscles and inflates the measurement

Ignoring this measurement and using only the bicep to set the entire sleeve taper

The forearm measurement bridges the gap between the bicep and cuff. It controls the mid-sleeve fit and ensures the sleeve tapers naturally down the arm. Without this measurement, sleeves either bunch at the forearm or gape open between the elbow and wrist.

Cuffs

Left Cuff

Measure around the wrist at the wrist bone (ulna styloid process). The tape should wrap around the wrist where a watch would normally sit. Keep the hand relaxed and open. Add 0.5" to 1" of ease beyond the bone circumference for comfort and so the hand can pass through.

Typical cuff sizes range from 7" to 10" for men, 6" to 8.5" for women

If the client wears a watch on the left wrist, add an extra 0.25" to 0.5" on that side

For French cuffs, add an additional 0.25" since the folded fabric adds bulk

The cuff should be snug enough that it does not slide over the hand but loose enough to be comfortable

Measuring too tight right on the bone without adding ease for the hand to pass through

Measuring too far up the forearm instead of at the actual wrist bone

Not accounting for a watch if the client wears one on this wrist

Assuming both wrists are the same size

The cuff is the most visible part of the sleeve and sits at a high-touch point. Too tight and it restricts hand movement and is uncomfortable. Too loose and the cuff slides around the wrist, catches on things, and looks sloppy, especially with cufflinks.

Right Cuff

Measure around the right wrist at the wrist bone. The tape should wrap around the wrist at the same position as the left, just above the hand. Keep the hand relaxed. Add appropriate ease for comfort and hand passage.

The dominant hand wrist is often 0.25" larger due to increased tendon and muscle development

Always measure both wrists independently for true custom fit

Ask the client which wrist they wear a watch or bracelet on to adjust ease accordingly

For clients who gesture frequently, slightly more ease in the dominant cuff prevents binding

Copying the left cuff measurement without actually measuring the right wrist

Measuring over a watch or bracelet without noting the addition

Measuring with a clenched fist which flexes the wrist tendons

Not noting which wrist the client typically wears accessories on

An independently sized right cuff ensures both wrists are equally comfortable and the cuffs present symmetrically. This attention to detail is what separates custom shirts from made-to-measure, where both cuffs are typically cut to the same size.

Cuff Depth

Measure the desired height of the cuff band from top edge to bottom edge. Standard cuff depth is 2.5" to 2.75". Measure vertically from where the cuff begins at the sleeve opening to where it ends at the wrist. For French cuffs, this is the depth before folding.

Standard barrel cuff depth is 2.5"; French cuffs are typically 2.75" to 3"

Taller clients with longer arms generally look better with a slightly deeper cuff of 2.75" to 3"

A deeper cuff reads more formal; a shallower cuff reads more casual

The cuff depth should be proportional to the collar height for visual balance

Confusing cuff depth with cuff circumference

Not adjusting depth based on cuff style; French cuffs are typically deeper at 2.75" to 3"

Setting the same depth for all cuff styles when barrel cuffs and French cuffs have different standard depths

Ignoring wrist size relative to cuff depth; larger wrists need proportionally deeper cuffs

Cuff depth affects both aesthetics and comfort. Too shallow and the cuff looks insubstantial and can twist around the wrist. Too deep and it restricts hand movement and covers too much of the hand. The depth also determines how much cuff shows below a jacket sleeve.

Body Length

Tail / Body Length

Measure from the base of the collar (where the collar band meets the yoke) straight down the back to the desired hem length. For a tucked shirt, the hem should reach at least 4 inches below the belt line to stay tucked. For an untucked shirt, the hem should fall between the hip bone and mid-fly. Measure with the client standing upright.

For tucked shirts, back length should be 32" to 36" depending on torso length

For untucked shirts, aim for a length that ends at mid-fly or 2" below the belt

The back tail is usually 1" to 2" longer than the front to account for the curve of the backside

Side seam length is typically 2" shorter than back length for a classic shirt tail shape

Measuring from the top of the collar instead of the base where the band meets the yoke

Not accounting for whether the shirt will be worn tucked or untucked

Making the tail too short for a tucked shirt, causing it to pull free during the day

Setting the same length for front and back; the back tail is typically 1-2 inches longer

Tail length determines whether a tucked shirt stays put or constantly pulls free. Too short and the shirt untucks when you raise your arms or sit down. Too long for an untucked style and the shirt looks like a nightgown. This is one of the most common fit complaints and is easily preventable.