Anvil Jersey T-Shirt
  S M L XL 2XL 3XL 4XL
Width (in) 18 20 22 24 26 28 30
Length (in) 27.5 28.75 29.75 30.75 32 33 34

This is the measurement of a t-shirt lying flat on the ground from armpit to armpit - sometimes this gets confused with chest measurement, which goes all the way around your chest, but this one is just the front of the t-shirt.

This is the measurement of the back of the shirt, from top to bottom.