Short answer
Collar cut to your exact neck plus working ease, independent of body size.
Why it happens
Collars come in fixed half inches tied to body size, not neck size.
Why ready-to-wear cannot fix it
Size charts grade uniformly; neck size between sizes is a personal geometry. A block adjusted in one place pulls in another — which is why the correction must exist in the pattern, not in the fitting-room mirror.
How the house drafts for it
Collar cut to your exact neck plus working ease, independent of body size. The correction is recorded in your Fit Passport, so every later commission starts from it automatically.
Where it matters most
This correction carries most for: shirt. It is reviewed at every fitting, in every city, for every garment.
Fit Library entry 23 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08