Shirt Style and Size
Choose your shirt size
Lift your arms up, and wrap a flexible tape measure around the highest part of your chest and shoulder blades. Drop arms to your sides (over the tape) to take the measurement. Remember, it should be under your arms!
Wrap a flexible tape around your waist, a couple of inches below your navel and right below the hipbones that poke out in the front. Keep one finger comfortably between your body and the measuring tape to make sure it's not too tight.
This is how long the shirt is from the shoulder to the bottom of the shirt, applies to Youth T-Shirt sizes.