Fitting and Alterations

Alterations split roughly into two categories that call for different tools and different amounts of patience. Fitting adjustments made before cutting — moving a dart, adding width at a specific seam, lengthening or shortening a pattern piece — are far easier to get right because you're still working flat, on paper, before any fabric or time is committed. Alterations made after a garment is fully sewn — taking in a finished side seam, letting out a waistband, adjusting a hem — are always more constrained, limited by whatever seam allowance and hem allowance were actually left, and they're the reason I try to fit as much as possible at the pattern and muslin stage rather than after the fact.

A wearable muslin — a full test version sewn in cheap fabric before touching the real fashion fabric — is the single best fitting habit I have. It shows fit problems (a dragging line pointing straight at wherever there's too little ease, a diagonal fold pointing at wherever there's too much) far more honestly than a flat pattern ever can, and it's cheap to unpick and adjust compared to doing the same to a finished silk garment.

The most common single fix, in my experience: a small dart or seam adjustment at the exact point a fold or pull line points to, rather than a broad resizing of the whole pattern. Most fit problems are local, not global, and treating them that way avoids overcorrecting.