Short answer
Knee room re-distributed and the inner seam curved to the true leg line.
Why it happens
Knees angle inward; straight tubes twist around them.
Why ready-to-wear cannot fix it
Size charts grade uniformly; knock knees 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
Knee room re-distributed and the inner seam curved to the true leg line. 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 14 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08