Fruit of the Loom Unisex Tees
100% pre-shrunk cotton. Fabric Weight: 5.0 oz (mid-weight)
UNISEX 
  S M L XL 2XL 3XL 4XL
Width (in) 17.99 19.49 21.97 23.98 25.98 27.48 28.98
Length (in) 27.99 28.98 30 30.98 31.97 32.48 34.49

  

Width
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.

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