Here is a great t-shirt by Champion. 50/50 blend of polyester and cotton, made in the USA. Most likely from the 1980s. Gray shirt with great graphic on the front in maroon. It's super thin, incredibly soft, comfy, and in excellent shape with tons of life left! The tag says Large, but here are the measurements taken laying flat. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 20"

Shoulder to end of sleeve (including cuff) 8"

Length 24"

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