We Highly Recommend Using The Fitted Jersey Guide, JERSEYS RUN SMALL.
Measure the circumference of your chest. Place one end of the measuring tape at the fullest part of your chest/bust, wrap it around (under your armpits, around your shoulder blades, and back to the front) to get the measurement. Make sure your measuring tape is level around your body. This can be hard so we recommend measuring in front of a mirror.
Measure the circumference of your waist. Use the measuring tape to circle your waist at your natural waistline, which is located above your belly button and below your rib cage (if you bend to the side, the crease that forms is your natural waistline). Don’t suck in your stomach, or you’ll get a false measurement.