This one piece swimsuit runs true to size and provides a fit that is supportive and functional, it is advised that you choose your size based on your dress or pants size. Therefore if you are a size 8 pants, we recommend going for our size SMALL (8). If you prefer a slightly looser fit or have a larger bust when compared to your waist size, it may be recommended that you go one size up. The same applies if you prefer a tighter fit, you could go one size smaller depending on personal preference.