Brand Size: L Because it has strong support, I recommend going one size up. In my personal opinion, if you wear a size M at UNIQLO, you might be a size L at Radianne. Of course, this varies from person to person... I bought two of these, but they didn't fit, so I'm sadly putting them up for sale (><) The fabric is thin and stretchy, and feels good against the skin. The color makes it easy to wear with light-colored tops. They fit snugly, so they're also easy to wear with tight-fitting tops. I tried one on and washed it. The other one is new with tags, never used. The one I tried on has some fraying on the sleeve, but only one thread of the double stitching is slightly broken, so there's no hole and it's not noticeable. See image 10. I was going to sell only the new one, but I'm including the other one as a bonus＾＾