XS S M L XL
US Size 00-0   1 - 3  5 - 7    9-11 13
Bust 30 - 32" 33 - 34" 34 - 36" 36 - 38" 39"
Waist 23 - 24" 25 - 26" 27 - 28"     29" 30"
Hip 34 - 35" 36 - 37"    38" 39 - 40" 41"

How to measure

Chest / Bust - Measure around the fullest part of your bust.
Waist - Bend to one side to find the natural crease of your waistline.
Hips - Standing with feet together, measure around the fullest part of your hips.