​Pre-Made Suits Sizing/Measurement Guide -

Bikini tops:
Small:               A cup
Medium:          B cup/small C cup
Large:               Full C cup/small D
 
 
Bikini Bottoms:
                               Size           Waist            Hips
Small:                    1-3            20"-25"        32"-36"
Medium:               4-6            26"-28"        37"-38"
Large:                    7-9            29"-31"        39"-42"