I ordered size up, Im medium but ordered large. Bikini fits fine and looks cute. Here is why I gave a 4. I needed strapless bra to tan for upcoming vacation, bra fits right however my boobs look really tiny. I ordered it black, and of course color contributes to a problem. Im size 36 C but in a bra I look like an A. I would recommend this product, but probably other color than black, just for visual purposes. Anyway, I didn't return it as Im not planning to use it as my primary swimming suite, just for tan lines.