The most reliable method to choosing the correct size waist trainer is to measure your waist right above your navel and refer to the size chart to find the corresponding size. You can also go by height/and weight, but keep in mind that this is a general method only since we all hold our weight differently. We recommend measuring.
If you are in doubt, or between sizes, choose one size up. Our waist trainers are meant to fit very tight, and may need help getting it on the first time until it breaks in a bit. If you need help choosing a size, please email us at support@angelcurves.com