Men's Filson Mackinaw Wool Jac Shirt - Oxblood/Black size Small I bought this new, and I'm always in between small and medium with Filson thick flannels. I made the mistake of going with small. I am 6'2" 180 athletic lean build and small fits with a t-shirt, and the medium is a bit loose but easily fits even a thick layer underneath. I have only worn this a couple times, and it is very warm. I think this is the best color they ever made. It comes with tags. Thanks!