There meant to fit big...over other layers. I have a size Small in that toggle in my possession, and I can actually harness the toggles shut. And I usually wear a 46-48 jacket. I think they're meant for some real chunky under layering to add some additional warmth. Granted, when I saw what I looked like in one, I could of passed for a cult leader with the hood on. I felt like Joe, in "the following"