Measure your waist and hips and compare to the size chart below. If you are between two sizes, we suggest selecting the larger size. To get the most accurate measurements, have someone else measure you. Be sure to hold the measuring tape straight and snug, not tight, to your body. Measure over the fullest part of your bust, with the tape measure parallel to the floor.
How to Size Competitive Swim Suits - Charts & Guides | XtremeSwim
Measure your chest right below your bust at the front and shoulder blades at the back. Try not to pull it too tightly, the tape measure should sit snug around your chest. Measure your bust circumference: wrap the tape measure around the fullest part of your bust at nipple level and breathe in. Round the measurement up to the nearest whole number.