How to measure yourself
Bust/Chest: In front of a mirror, turn sideways and measure around the biggest part of your chest (*with your bra on*) and your arms down (yes this is tricky, get a helper if you can). Try to keep the tape measure parallel to the floor for the best accuracy.
Waist: Wherever the smallest part is, that's your waist. Contrary to popular misconception, your waist is not related to your belly button. Everyone's waist is in a different place so just find the smallest part and go with it!
Hip: It has nothing to do with your hip bone - it's really your bum. Looking sideways in the mirror and keeping the tape parallel to the floor, measure around the part where your bum sticks out the most.