Sustainable organic cotton, top piece of a set (bottom in another listing), this would be super fun to wear under a sheer top or a deep v / buttonup. A bra that is meant to be seen. Also great as a beach wear base layer. It’s less of a swim suit (though you could) it’s more of a play suit. Love the texture and weight, I wish it fit me but I’m a little too big for it. I have two, neither have tags, one was worn once.