Model is a true size XS and is pictured wearing a size S

Measurements while laying flat:

Size XS: chest: 13.5 inches, length: 18 inches, waist: 14.5 inches

Size S: chest: 14.5 inches, length: 18.5 inches, waist: 15.5 inches

Size M: chest: 15.5 inches, length: 18.75 inches, waist: 16.5 inches

Size L: chest: 16.5 inches, length: 19 inches, waist: 17.5 inches

Size XL: chest: 17.5 inches, length: 29.5 inches, waist: 18.5 inches