A parka is formed with a substantially rhomboid shaped beaver tail secured at the center and adjacent to the bottom of the back of the parka and is movable from a stored position to a deployed operative position wherein it extends between the legs and part way up the front of the parka, thereby to pull the bottom circumferential edge of the parka into close relationship with the top, the outside of the legs of the wearer while the beaver tail is in close contact with the inside of the legs in the crotch area to provide a better sealed garment.