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Shirt outline with measurement points.
1. Length - Top of shoulder straight down
2. Shoulder - outermost points across upper back
3. Chest - 1" below armpit straight across
4. Sleeve - Top of shoulder down arm

S M L XL 2XL
Chest 21.9  22.6  23.6  24.6  25.6 
Length 27.6  28.3  29.1  29.9  30.7 
Shoulder 21.1  21.7  22.4  23.1  23.9 
Sleeve length 8.2  8.4  8.7  8.9  9.1 

All measurements are in inches.