Overshirts under winter coats: how do I pull it off?

Hey everyone. As the title suggests, I'm wondering if it is possible to layer some "heavyweight" and regular overshirts under winter coats such as a duffel coat, pea coat, parka and puffer. The thing I'm really worried about is the length as most of these midlayers sport a slightly oversized fit and could overlap past the outer layer if it stops around the waist.