Here is a super cool short sleeve shirt by ORO Golden Threads It's 50% cotton, 50% polyester. It features vibrant stripes of green, blue, yellow, orange, and white, with green collar and three button front. Super comfy, and lots of life left. The tag says X Large, but here are the measurements. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 22"
Shoulder to end of sleeve (including cuff) 9"
Length 29"

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