Bust: Wrap the tape around the fullest part of the chest. Make sure there is an inch space for the tape to move.
Waist: Measure the circumference of your waist. Use the tape to circle your waist (as a belt would) at your natural waistline, which is located above your belly button and below your rib cage. (If you bend to the side, the crease that forms is your natural waistline.)
Hips: Measure the circumference of your hips. Start at one hip and wrap the tape measure around your rear, around the other hip, and back to where you started. Make sure the tape is over the largest part of your buttocks.