Here is an awesome vintage T-shirt by Signal. 50/50 poly and cotton blend, and made in the USA. Yellow shirt with great Royal Caribbean graphic on the front in black. Light weight, super soft, comfy, and in amazing condition with tons of life left. The tag says Large, but here are the measurements. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 19"
Shoulder to end of sleeve (including cuff) 8"
Length 27"

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