Fits true to size. If you're in between sizes, there is an option to go down into the smaller size, or up into the larger size.
The blonde model is wearing a size small.
The brunette model is wearing a size small. Her true size is typically a medium, size 7, 5'0", 36D bust. She said the small fit fine, but she'd prefer the medium. Note the brunette is shown wearing the green colorway which is not currently available. This listing is for the burgundy sparkle color.