My chest size is 36G, so I almost always get a large in "poplin" material. But this is *kinda* oversized (not too much, just the right amount), so I went with a medium and I'm glad I did. Because of the open-front design, you may be able to get away with going down one size, depending on your boob size. It's a very sexy top. You can leave it completely open, or if YOU have fabric tape, customize how closed you want it. and I love having that option. definitely getting it in black.