Bracketing Dress Shirts: Neck Size Decides, Everything Else Follows
Most shirts get returned for sleeve length, but most shirts should be bought on neck size. The collar is the only part of a dress shirt you cannot cheat. A body can be tucked, a sleeve can be worn with the cuff button moved, but a collar that will not close, or that closes and strangles, ends the shirt. Bracketing two sizes in a dress shirt usually means bracketing two collar sizes, a half inch apart, and that half inch decides the whole garment.
Measure your neck with a tape at the level where the collar sits, and add nothing. Shirt makers already build in wearing ease, typically about half an inch between the marked size and the buttoned collar's inside measurement. If you measure 15.5 inches and add ease yourself, you have just ordered a 16.5 collar that will gap under a tie.
The two finger test is out of date
The old rule said a correct collar fits two fingers between neck and collar. On a new shirt that is too loose. Starching and laundering shrink a cotton collar slightly in the first washes, but modern pre-shrunk shirting moves very little, and a collar that starts with two fingers of room ends the year sliding around under a tie knot. Aim for a collar that buttons without pressure and lets one finger in comfortably on day one.
Try the collar with the tie you actually wear, if the shirt is for a tie. A wide spread collar with a thick knot takes up more room than the same shirt worn open. If you only wear the shirt open collared, judge the collar lying flat and even instead, because a too big collar worn open folds and curls at the points.
Sleeve and body rarely agree with the neck
Here is the trap bracketing exposes: the collar that fits often comes with a sleeve an inch too long, because brands grade the whole shirt up together. Before you keep either size, check whether the brand sells the same collar in a separate sleeve length or a slimmer body fit. Many do, and swapping to the right combination beats settling for the bracket winner that is merely least wrong.
Body fit is the easiest part to judge and the least important to get perfect. A shirt that pulls at the middle button when you sit is too small in the body regardless of collar. One that billows at the waist can be darted by a tailor for modest money, or simply sized down in fit, slim instead of classic, at the same collar size.
Wash neither shirt until you have chosen
Both shirts in a bracket have to go back in resalable condition, which means no wash, no iron on a high setting, and the collar stays and pins kept with the packaging. Decide on the try-on, not after a wear to the office. If you are genuinely between collars and the event is months away, keep the larger collar: necks change less than waists, but a collar that fit exactly in a cold fitting room feels tighter on a hot day in a full room, and there is no alteration that adds collar room.
Related reading: Bracketing Work Trousers by Hem Length, Not Just Waist, Bracketing Swimwear Without Breaking the Return Rules, Return Window Math: Bracketing When a Sale Is Ending.
Frequently asked questions
How should a dress shirt collar fit when new?
It should button without pressure and admit one finger comfortably. The old two finger rule leaves most modern pre-shrunk shirts too loose once the collar settles.
Should I buy a dress shirt by neck size or body fit?
By neck size first, because the collar cannot be altered or cheated. Then solve the body with the brand's fit options, slim or classic, and the sleeve with separate sleeve lengths where offered.
Will a shirt collar shrink in the wash?
Cotton collars shrink slightly in early washes, but most modern shirting is pre-shrunk and moves very little. Do not buy a tight collar counting on stretch, or a loose one counting on shrinkage.
Can a tailor make a shirt collar bigger?
No. A tailor can slim a body, shorten sleeves, and move a cuff button, but collar size is fixed by the pattern. That is why bracketing collar sizes is worth doing.