A = BUST. Measure all around the fullest part of the bust, with arms outstretched either side.
B = WAIST. Measure around the natural waistline. The narrowest part of the torso.
C = HIPS. Measure around the fullest part with feet slightly apart
D = FULL GIRTH. Start at the top centre of the shoulder, take the tape down through the legs and back up to the same shoulder start position, while keeping the arm outstretched and legs slightly apart.
If you find after measuring that you are across sizes we would recommend that you contact us to discuss your options. We can recommend on sizing and fit and we can always custom a pattern.