Here is an awesome vintage T-shirt by Sportswear. 50/50 poly and cotton blend, made in the USA. Light blue shirt with great red, white, and blue graphic on the front repping the US Army tank and armaments command. Light weight, soft, comfy, and in excellent condition with tons of life left. The tag says Medium, but here are the measurements. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 18"
Shoulder to end of sleeve (including cuff) 7"
Length 25"

This item is sold from a vintage boutique in Roanoke, VA.