Measuring for a Custom Shirt: The Numbers That Matter
Measuring for a custom shirt means recording neck, chest, waist, shoulder, sleeve, and length in a consistent way, ideally taken from a shirt that already fits well. Small errors in shoulder and sleeve cause the most visible problems, while chest and waist can usually be adjusted more easily.
Start from a shirt that fits
The most honest measurement set comes from a shirt you already reach for. Lay it flat, button it fully including the collar, and smooth it without stretching. Measuring a garment removes guesswork about ease, because the comfort allowance is already built into numbers you know feel right.
For more on this, see this related guide and our earlier explainer on the same theme.
If no shirt fits well enough to copy, measure your body with help and tell the maker exactly which fit problems you are trying to solve. A too tight chest on your current shirts is useful information that raw numbers alone do not carry.
The core measurements in order
Neck first: measure around the base of the neck where the collar sits, with two fingers of ease, or measure a good collar from button center to buttonhole center. Next, chest at the fullest point under the arms, waist at the level where the shirt will sit over your trousers, not your natural narrowest point if those differ.
Shoulders are measured seam to seam across the back on a shirt, or bone to bone on the body. Sleeve length runs from the center of the back of the neck, over the shoulder, to the wrist bone. That longer path is why sleeve numbers look surprisingly large compared with arm length alone.
Length, cuffs, and the details people forget
Shirt length decides whether tails stay tucked. Measure from the base of the collar down the back to the hem on a shirt whose tuck you trust. Cuff size matters if you wear a watch: tell the maker, and the left cuff can be made slightly roomier instead of fighting the watch all day.
Readers also found this companion piece from our archive useful.
Record posture notes too. Square or sloping shoulders, a prominent shoulder blade, or one arm longer than the other are common and easy for a maker to accommodate when told in advance, and nearly impossible to fix gracefully afterward.
Checking the first shirt
Treat the first custom shirt as a fit sample. Wear it for a full day, wash it as you normally will, since cotton shrinks a little, and only then judge the numbers. Note where it pulls, where it billows, and whether the collar and cuffs sit right after washing.
Good makers expect one refinement round. Small changes, a quarter inch here, half an inch there, turn a good first shirt into a pattern worth reordering for years, which is the real value of going custom in the first place.
Frequently asked questions
Should I measure my body or a shirt I own?
Measuring a favorite shirt is usually more reliable for online orders, because the numbers already include the wearing ease you like. Body measurements need allowances added, and different makers add them differently.
What is the most important shirt measurement?
Shoulder width and collar size are the hardest to alter later, so they matter most. A collar that is half an inch off is felt all day, and shoulders that sit wrong make the whole shirt look borrowed.
How long should a dress shirt be?
A shirt meant to stay tucked should reach roughly the middle of the seat when untucked, long enough to stay in place when you raise your arms. Shorter fashion lengths suit untucked casual shirts only.
How much extra room should the chest have?
Most wearers are comfortable with about three to five inches of ease over their actual chest measurement in the finished shirt. Slim fits sit at the low end, and very tight chests pull at buttons and wrinkle horizontally.