Here is a great guide on how to take your measurements, and find out your bust size or waist size. To get the right size, measure carefully, and update your measurements regularly.
When you have your correct measurements, you can easily find your US size.
Take your measurements
To find your correct size, use a tape measure and take these measurements. Stand with your back straight in front of a mirror, to make sure that you measure correctly and that the tape measure is kept level.
1. Bust size
Measure under your armpits, around your shoulder blades, and over the fullest part of your bust. Don’t pull the tape measure too hard. For fitting a bra, you also need the measurement just under your bust.
2. Waist size
Measure around your natural waistline. This is the narrow part of your waist, about an inch above your navel. Making sure the tape measure is parallel to the floor, and snug but not too tight. Relax and breathe out before you measure.
3. Hip size
The hip should be measured around its fullest part (about 8 inches below your waist). Place the tape measure around this point while standing up straight with your feet together, ensuring that it is level.
This is the measurement from your ankle to the highest point of your inner thigh, when you stand with your legs straight. If possible, ask a friend to help you. This can also be measured on a pair of pants with the proper length.