Size guide. SIZE RELATIVE CUP SIZE BUST WAIST HIP XS 2-4 A 32″-33″ 24″-25″ 35″-36″ S 4-6 B 34″-35″ 26″-27″ 37″-38″ M 6-8 C 36″-37″ 28″-29″ 39″-40″ L 8-10 D 38″-39″ 30″-31″ 41″-42″