Short answer
The side seam is curved and the leg tube re-balanced so the crease falls straight again.
Why it happens
The leg curves outward from the thigh down.
Why ready-to-wear cannot fix it
Size charts grade uniformly; bow legs 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
The side seam is curved and the leg tube re-balanced so the crease falls straight again. 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: trousers. It is reviewed at every fitting, in every city, for every garment.
Fit Library entry 13 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08