Does this stuff have enough room to wear other layers under it, if wearing the correct size?
I wouldn't have an issue of going i size up as long as it doesnt fit "baggy". I hunt in northern ontario and it gets cold in the mornings and multiple layers are not uncommon.

Also a suggestion on a product is those hand warming muffs, and hooded sweat shirts.

Just my Two cents, or 0.024 cents USD.