The Roebuck Shirt in Emerald Tartan

We dialed in the fit of this shirt and perfected the old world style gusset, with the three needle chainstitch runoff (thats functional not just for looks). Built of a breezy summer weight, 4.5 oz. Japanese cotton flannel, with extra durable shanked cat-eye buttons. This is the shirt on which I build my church. Made in Bridgeport, Conn.

Model is 5'11" 165lbs. wearing a medium for a regular fit, but he would size up for a relaxed fit in real life, and so should you but who am I?