Size S / 8R M / 10R-12R L / 14R-16R XL / 18R-20R
Chest 27 28-29 30-32 33-34
Waist 24 25-26 27-28 31-33
Hip 28 29-30 31-33 34-36

How to measure your bust/chest: WIth arms relaxed on both sides, measure under the arms around the fullest part of your bust/chest.
How to measure your waist: WIth heels slightly apart, measure around the narrowest part of the waist.
How to measure your hip: WIth the heels slightly apart, measure the fullest part of the hip.

Keep the measuring tape parallel to the floor for the best result.