Vintage, Wrangler, BRUSHPOPPER Shirt. It is size 17 1/2 X 35 L. Snaps. It is the older, "heavy", Brushpopper material. these were almost indestructible. I worked for years at a western wear store here in Tucson, I know where these came from, they belonged to my husband. I believe they changed the weight of the shirts, later, simply because they lasted too well, This is in great, excellent  condition, ready for it's next life.