How to measure:
Bust- Measure the bust line at the fullest part of your chest. Pull the tape as tight as you can without changing the shape of your breasts. While you are being measured, your arms should be at your side and relaxed.
Waist- Use the tape to circle your waist (sort of like a belt would) at your natural waistline, which is located above your belly button and below your rib cage.
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.