Short answer
Sleeve length set to the wrist bone exactly, with the elbow bend accounted for.
Why it happens
Arm length beyond the graded sleeve step.
Why ready-to-wear cannot fix it
Size charts grade uniformly; long arms 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
Sleeve length set to the wrist bone exactly, with the elbow bend accounted for. 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: suit, shirt, overcoat. It is reviewed at every fitting, in every city, for every garment.
Fit Library entry 18 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08