I'm not sure who developed the sizing, but it doesn't line up with any other major brands. I wear Small for tops, though usually tanks run large so I buy XS in major brands and they're great. Fit like a slim t-shirt. But this tank top was VERY SLIM to the point I feel like a sausage. Okay for sleeping and working out at home, but I won't be able to wear it in public. I will buy more in the future but in a Small. It is very soft, thanks to the fabric blend.
