Does anyone else find the fit of the Mystique Parka awkward?

This might just be the most unflattering coat they make. If I wear my actual size zipped, size small, it's too bulky when walking from the neck to the hips and much thinner in the leg area. If I size up to a medium, it looks way oversized and when it's zipped and I look like a small head sticking out from within a giant blanket. Since I want a coat that does well in extremely cold temperatures, I'm about to just keep the medium and settle for looking like I'm wearing a coat almost two sizes too big. Still incredibly unflattering.

I know the coat zips up from the bottom for extra room but doing that really defeats the purpose of such a warm coat since cold air can enter the coat much easier that way.

Is this just a common issue with long parkas like this?