Here is a cool vintage button down long sleeve Western Snap shirt by Man'sway. Most likely a poly and cotton blend. Handsome plaid of yellows, blues, and orange. Seven button front, three on each cuff, and a buttoned pocket on each breast. It's light weight, fairly sheer, soft, and in amazing shape with tons of life left! Here are the measurements. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 21"
Shoulder to end of sleeve (including cuff) 24"
Length 29"

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