BUST
Measure the circumference of your bust at the fullest part of your chest. Under your armpits, around your shoulder blades, and around the front of your chest. Please keep in mind that your bust size is not the same as your bra size.
WAIST
Measure the circumference of your waist at your natural waistline. If you bend to the side, the crease that forms is your natural waistline.
HIP
Measure the circumference of your hips over your hip bones and around the fullest part of your buttocks.