Measure the circumference of your chest. Wrap a soft measuring tape around your back where your bra band would be, under each arm and around the front to the top of your bust.
Measure the circumference of your waist. Use a soft measuring tape to circle your waist, without depressing the skin, which is located above your belly button and below your rib cage.
Measure the circumference of your hips. Start at one hip and wrap the soft measuring tape around the largest part of your buttocks, around the other hip, and back to where you started.