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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 24.0  24.8  25.6  26.4  27.2 
Length 24.8  25.6  26.4  27.2  28.0 
Shoulder 20.9  21.7  22.4  23.2  24.0 
Sleeve length 21.7  22.0  22.4  22.8  23.6 

All measurements are in inches.