Here is a stylish button down long sleeve shirt by JC Penney. Handsome plaid of blues, yellows, red, and dark gray. Seven button front, one on each cuff, and a pocket on the left breast. This one is in amazing condition with tons of life left! The tag reads Medium 15 - 15 1/2, but here are the measurements. (please refer to last photo to see how I measure men's shirts)

Shoulder to end of sleeve (including cuff) 21"
Chest (armpit to armpit) 23"
Length 32"

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