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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
Chest 18.7  19.1  19.5 
Length 17.1  17.5  17.9 
Shoulder 15.7  16.5  16.9 
Sleeve length 6.3  6.5  6.7 

All measurements are in inches.