I bought a medium... probably would’ve gotten large just because I like a loose fit when I run (Flowy’)..... just my preference so I love it for cute casual wear!
I love to run in and/or hang out in this tank. It's very breathable fabric. I recommend sizing up. I'm usually a large top/medium bottom in Zoot gear and found myself most comfortable in an XL (36B chest, 30 waist). But now I have both a L and XL. I prefer to run in the XL.