Vintage Mens Pendleton plaid board wool flannel shirt USA made size S

Vintage mens Pendleton long sleeve flannel board plaid shirt. Made in USA 100% wool, gray, brown and navy. Only flaw is that I think it has been shrunk. Shirt is labeled medium but it is measuring more like a small. Please check these measurements against a shirt that fits you: Measured lying flat. Chest: 19.5” Shoulder to bottom hem: 25”