Place measuring tape around the waistband with two fingers space and make the tape snug or tight according to the body shape.
Place measuring tape around hips at the hip bone area (fullest part) with two fingers space. Tape should be snug and at level.
Place measuring tape around the thigh near the lowest point of the crotch with two fingers space. Tape should be snug and at level.
Place the measuring tape from the center of front rise, across the crotch and then up to the center of the back waistband. Make sure to fit well and usually the measurement can be 1 CM large.