All sizes are approximate.

Size measurements
CLASSIC FIT XS S M L XL XXL
Chest 40" 41" 42" 43.5" 45" 46.5"
Short sleeve length from armhole 7.75" 8" 8.25" 8.5" 8.75" 9"
Long sleeve length from center back neck  33" 33.75" 34.5" 35.5" 36.5" 37.5"
 
CLASSIC FIT XS S M L XL XXL
Chest 102 104 107 110 114 118
Short sleeve length from armhole 20 20 21 22 22 23
Long sleeve length from center back neck  84 86 88 90 93 85
 
Size measurements
SLIM FIT XS S M L XL XXL
Chest 38" 39" 40" 41.5" 43" 44.5"
Short sleeve length from armhole 7.5" 7.75" 8" 8.25" 8.5" 8.75"
Long sleeve length from center back neck  33" 33.75" 34.5" 35.5" 36.5" 37.5"
 
SLIM FIT XS S M L XL XXL
Chest 97 99 102 105 109 113
Short sleeve length from armhole 19 20 20 21 22 22
Long sleeve length from center back neck  84 86 88 90 93 95