NWT J.Crew Bikini Swim Suit Classic Sculpt Mira Top in black. Size S.
"Our magic swim fabric, designed to hold you in and lift you up. It's crafted from two layers of ultra-fine fabric that are knit together or "interlocked" for subtle compression with a lightweight feel. Plus, the comfy lining is designed to stretch out and then snap back into place, so your suit will always hold its shape. This one comes with a U-shaped cutout at the center that shows a peek of skin, plus adjustable straps that cross in the back.