XS- Designed for women with a size 32 pant and no more than a 75 bust.
S- Designed for women with a size 34-36 pant and no more than an 85 bust.
M- Designed for women with a size 36-38 pant and no more than a 90 bust.
L- Designed for women with a 90 bust or larger.
The model in these photos is wearing a size M.