See The Tempt Me Fit Guide for hints and tips on obtaining the right fit for you.
Tips:
Bust: measure over the fullest area of your bust & straight around your back. Waist: measure narrowest part of the torso. Hip: measure at the fullest part of your hop ensuring the tape is straight.
S(US 4-6): Bust 34"-35", Waist 26"-27", Hip 36.5"-37.5", Height 5′-5′3"
M(US 8-10): Bust 36"-37", Waist 28"-29", Hip 38.5"-39.5", Height 5′1"-5′4"
L(US 12-14): Bust 38.5"-40.5", Waist 30.5"-32", Hip 41"-42.5", Height 5′2"-5′5"
XL(US 16): Bust 41.5", Waist 33.5", Hip 44", Height 5′3"-5′6"
XXL(US 18, US 14W): Bust 43", Waist 35", Hip 45.5" , Height 5′4"-5′7"
XXXL(US 16W): Bust 45", Waist 36.5", Hip 47", Height 5′7" and above.