I love wearing this long-sleeved top over the tank top in the summer. I live in New York City, and everywhere is too cold when I'm at work or on the train/bus, or gym. I work as a figure skating coach, and lightweight long-sleeved top is a must have. I loved this so much, so I bought 4 of them, pink, blue, and black.
I'm 5'2, 120lb, in good shape, size XS fits me without tightness, bcz of the design, I picked one size smaller.