SIZE CONVERSION MADE EASY: Did you know Fantasie Swim is sold in UK sizing? Please use the size chart to convert your US to UK size. To find your size, measure around the torso underneath the breast tissue to determine your band size. If measurement is an odd number, round up to the following even number. Measure around the fullest part of the bust to determine your bust size. To determine your cup size, subtract your band size from your bust size. Fuller coverage cups with concealed side sling for forward profile Powernet lined wings for support and anchorage Gathered cups flatter all bust shapes. Fixed fully adjustable shoulder straps. Tortoise shell look apex ring detail