I'm a heavier chested girl, but I figured with the nylon and spandex that this shirt would stretch pretty well, since they didn't list any sizes. I figured it was a "one size fits most", and most "one sizes" can fit me. And while it does fit, it requires a bit more stretching of the material and squishing of the twins to get the shirt to fit. The sleeves are long, which I really like and once the shirt is over the bust it fits really nice under the bra. Its a great accessory to my gothic and raver attire. I just wish it was a tad more elastic for something that's only one size.