Circumference around your ribcage at the fullest part of your bust. This is usually nipple height.
This can be a little confusing because a lot of people don’t actually know where their natural waist is. It is not always the smallest part of your torso if you don’t happen to have an hourglass shape. Your waist is located halfway between the end of your ribs and the top of your hip bones.
The hip measurement is not literally taken from around your hip bones, rather, the hip measurement indicates the fullest part around your bottom.