"I usually find that size xs is a bit large on me, but this item fits like a glove. I am pretty small (small chest, included). This tank is skin tight, and the fabric has very little give to it. I imagine that, if you find your normal size is usually tight on you, this tank will be too small and so you will want to size up. I'm not sure if this tank will work for someone with larger breasts - I think that might be what causes it to fit strangely about the neckline for some. I cannot be sure positive about that, though. Personally, I am in love with this tank - it is perfect for my body type (and that doesn't happen too often).. great value for the price."