I'm usually a size small but after reading the reviews I ordered a medium. This is a cami so it really doesn't matter if you size up so size up anyway to be safe. Better loose than too tight or small as the loose fit wouldn't really show in a cami. I got it in coral and the price ($8 with free two day shipping) was right and I love it. For reference I'm 5'5, 125lbs, 34b. And the medium was a fitted fit on me, I honestly think the small would have been tight.