Miki Reversible One Piece Mermaid Tail Blue. Reverses to Solid Navy. Lightly padded cups, cross back adjustable tie. Adjustable keyhole side ties at hips. XS=0-2, S=2-4, M=4-6, L=6-8, XL=8-10. Approximate cup sizes per size: XS, S, M fits A-C cup, L-XL fits B-D cup. If you have a longer torso, or are tall, go up a size, and the hips are adjustable so you can make it tighter if needed.