Sew a long "baste" stitch to test the movement. Sit down to ensure it’s not too tight.
Cut a small vertical slit at the side seam or back waistband.
Sew the final line and trim the excess fabric, finishing the edge with a zigzag stitch or serger. Letting Out the Hips (Adding Room) Altered Clothing: Hip Fixes and Transformations...
Turn the garment inside out. Pin along the side seams, starting from the waist or mid-thigh and tapering into the existing seam.
When adding panels, ensure the fabric grain of the new piece runs in the same direction as the original garment to prevent weird twisting. Sew a long "baste" stitch to test the movement
"Smile lines" or strained fabric across the front or back, indicating the garment is too tight.
The waist fits, but the back of the waistband pulls away from your spine. Sew the final line and trim the excess
Excess fabric that pouches out at the widest part of the hip.