Remove pin at crossgrain of side hip. Shift muslin so the side seam line on the muslin is at the side seam of the form, for ease allowance.Re-pin on the stitch line.
Smooth muslin from HBL at side seam upward to side waist again and pin. The waist should fit smoothly from the princess line to the side seam (with the ¼" ease tuck). Pencil rub side seam.