Womens Mens
  Small Medium Large X-Large Small Medium Large X-Large
Width 15-1/2" 16-1/2" 17-1/2" 18-1/2" 18" 20" 22" 24"
Length 23-3/8" 26" 26-5/8" 27-1/4" 28" 29" 30" 31"
Length is measured from the back collar to the shirt's base.
Chest width is measured from armpit to armpit.