VTG 80s Key Elements plaid short sleeve shirt mens sz M (?)

Great fall colors, this vintage plaid shirt sleeve button down shirt has a warm combination of red, yellows and oranges blended with white and blue to achieve authentic 80s vibes. Overall in good condition - there seems to be a small ink spot on one of the chest pockets - see pics for details. Men’s size MEDIUM (tag missing, size estimated based on measurements) Chest: 21” across Length: 16.5” armpit to hem 65% polyester 35% cotton