I wear a size 70C. I bought a size M, but the circumference is a bit loose. The cups seem to fit roughly, but the center opens up a bit too much. But it's really comfortable. It feels like wearing a bralette. There's no feeling of tightness. It doesn't gather the chest much, but the fit isn't bad. It seems similar to the model's... The price is cheap, so I'm planning to buy more to alternate wearing them.