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.
Using the same fabric Marine Layer uses for their Corbets (two absurdly soft pieces of fabric, filled, and quilted) but they made it a little thicker for this, so you can wear it as a jacket of sorts. There's also a different color inside, so you can show a little contrast color depending on how you roll (... up your sleeves).
77% Polyester, 23% Rayon
Signature Corbet Quilted Fabric
Machine wash cold, tumble dry low
Model is 6'2", and is wearing a Medium.