Margot Robbie and her husband Tom Ackerley [1] spent time on holiday in Costa Rica, swimming in the water and watching the sunset. And man, let us tell you, as Margot walked out of the ocean, showing off her swimsuit from all angles, we couldn't help but think the obvious: who needs a bikini [2]?

The gorgeous star was sporting a slick black maillot with a strappy back that dipped slightly low at the front, hugging her body like a glove. Simple enough, it was by far the sexiest thing on the beach — and we weren't even there. We just know! Ahead, zoom in on Margot's accessories, a simple gold chain and mini hoops, then shop a handful of similar designs we found.