The Iris One Piece is a signature for ELCE. Designed with a soft underwire bra cup, fully adjustable straps, open back detailing and clasp finish. Perfectly suited for bust sizes A-D. Generally, we suggest: Size XS = A cup, Size S = B cup, Size M = C cup, Size L = D cup, Size XL = DD cup. However, please consider this together with our size guide, the style of the garment and your full bust circumference.