It fit TTS; I'm 5'7, 150-155lbs, athletic build and ordered a L. The arms were perfect length since I have a bit longer arms.
It's such a cute, affordable staple piece for your wardrobe. It was a nice thin, silky material especially for these warmer months. It's not too tight or loose; if you like the looser fit, I'd size up from your normal size.
So cute I'll be ordering other colors!