Here is a super sweet vintage polo shirt by Medalist. 50/50 cotton and poly blend, made in the USA. Bold red shirt with green, yellow, and blue accents. Three button collar. Soft, comfy, and in amazing condition with years of life left! The tag says 20, but here are the measurements. (refer to the last pic above to see how I measure shirts)

I also have a blue version of this shirt in the same size!

Chest (armpit to armpit) 18"
Shoulder to end of sleeve (including cuff) 10"
Length 26"

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