Called an overshirt, because it's a heavyweight button down that can be worn alone... or you know, over a shirt. See where we're headed here? Wear it as a jacket over a tee, or by itself. Ya can't go wrong. We're using the same fabric we use for our Corbets (two absurdly soft pieces of fabric, filled, and quilted) but we made it a bit heavier so you can wear it as a jacket-type thing. We also gave it a different color inside, so you can show a little contrast color depending on how you roll (... up your sleeves). Gordon is 6’1”, wearing a Medium, and is running the New York City Marathon.