When adding panels, ensure the fabric grain of the new piece runs in the same direction as the original garment to prevent weird twisting.
Always sit down while pinning. Your hips expand when seated; if you fit them perfectly while standing, you might pop a seam later. Altered Clothing: Hip Fixes and Transformations...
In trousers, tightness at the hips often causes the fabric to pull toward the crotch seam. 2. Structural Fixes: Step-by-Step Taking In the Hips (Reducing Volume) When adding panels, ensure the fabric grain of
Excess fabric that pouches out at the widest part of the hip. When adding panels
Turn the garment inside out. Pin along the side seams, starting from the waist or mid-thigh and tapering into the existing seam.
Cut a small vertical slit at the side seam or back waistband.