Measure at the fullest part of your bust, by placing the tape measure under your arms and across your shoulder blades. Remember to breathe out when taking this measurement.
Decide where you want your trousers to sit (on the hips, above the hips) and measure at this position. Ensure that the tape is horizontal to the ground.
Measure around the fullest part of your bottom, about 20cm below your natural waist, at the top of your legs.
Measure from the top of the inside leg (crotch) to the bottom of the ankle bone. Make sure the trouser crotch is sitting comfortably against the body and is not sagging.