A: BUST
Measure with your arms outwards measure around the fullest part of your bust.
B: WAIST
Measure around the waist, if you are unsure of the location slightly bend to locate it and then measure standing upright.
C: HIPS
Measure around the fullest part of your hips. (Not just hip bone to hip bone).
D: LENGTH
Measure from thorax to floor ideally wearing your desired heel height.
Note: It is always more accurate to have someone else measure you where possible. Do not pull the tape measure tightly.