1. Bust Measure the circumference of the fullest part of your bust. 2. Waist Measure the thinnest part of your waist. 3. Hips Measure the fullest part of your hips. 4. Height Measure your height. 5. Underbust Measure straight across the underbust band from one side to the other. 6. Cup The difference between your bust size and bust line size.