Know your measurements.
If you are not sure, this is how you can find out.
(Note: all measurements taken close to the body, not
over loose clothes)
A. Chest: Measure at the fullest part of the chest
or bust.
B. Waist: Measure circumference at the narrowest
part.
C. Hips: Measure at the fullest point, standing with
feet together
D. Weight
E. Height