Vintage 70's men's M Big Mac orange, gray, black plaid long sleeve flannel shirt

Vintage 70's early 80's Big Mac men's size M gray, black and orange plaid long sleeve flannel shirt! Great piece. Large plaid print. Buttons up the front. Two front pockets. Sleeve ends button. Thick woven flannel material. Fabric shows some wear but overall good vintage condition. Happy to answer any questions :) Measurements: Pit to pit- 22 inches across. Length from shoulder to hem - 27 inches. About 25 inches on the sides. Shoulder seam to shoulder seam - about 18 1/2 inches across. Sleeve length from shoulder seam - 22 1/2 inches. Sleeve length from armpit - 20 inches.