Bust: Place the tape measure under your arms, over your shoulder blades and across the fullest part of your bust. Remember to breathe out first. Waist: Measure around your natural waist. You can find it by bending to the side like a teapot (singing is optional). Hips: Measure around the fullest part of your bottom at the top of the leg, at about 20 cm/8 inches below your natural waist. Waist position guide: When working out which size to order, always measure your natural waist. All our skirts are designed to fit the natural waist unless otherwise stated. Trousers will be described in one of the following two ways: Natural waist, Below natural waist-which means about 4.5 cm (1.5 inches) below your natural waist.