Great fit!
"I wanted to wear this over a sports bra and wanted the fit to be a little loose; the description & photos confused me a bit, and I thought it might fit tight in the chest and therefore be uncomfortable over a sports bra. However, turned out perfect! For reference, I'm 5'7", 120 lbs, 34A and I got size small. If you have larger boobs than me, it will fit tight, and I definitely wouldn't wear this w/o a bra."