Here is a great vintage T-shirt by Sportswear. 100% polyester and made in the USA. Blue shirt with ribbed fabric, and white accents on the collar and sleeves. Soft, comfy, and in amazing shape! The tag says small, but here are the measurements taken laying flat (please refer to the last pic to see how I measure shirts)

Chest (armpit to armpit) 18"

Shoulder to end of sleeve (including cuff) 9"

Length 24"

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