1. Bust size
Measure around your chest, at the fullest point of the bust (not under the bust). Wrap it around under your armpits, from back to the front. Stand and breathing normally.
2. Waist size
While standing up straight, bend at the waist to one side. Use the tape to circle your waist. Don't suck in your stomach, or you'll get a false measurement.
3. Hip size
Standing with your feet together, measure around the fullest part of the hips. Make sure the tape is over the largest part of your buttocks.
4. Length size
The top or dress length measurement is taken from the top of the shoulder, close to the mid side of your neck, following your body down to the point where the top or dress end.