Exact measurements from the official supplier spec sheets, in inches.

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S M L XL 2XL
Chest (to fit) 34-36 38-40 42-44 46-48 50-52
Chest (laid flat) 20 22 24 26 28
Body Length at Back 27 28 29 30 31
Sleeve Length (from Center Back) 34 1/2 35 1/2 36 1/2 37 1/2 38 1/2

How we measure: chest is across the chest one inch below the armhole, laid flat; body length from the high point of the shoulder to the hem at the back; sleeve from the center back of the neck to the sleeve hem.