Older model N-B3 “Snorkle” parka . From what’s left of the black label, it appears to be made by Skyline. Originally used at Ellsworth AFB near Rapid City, SD.
It has wool lined pockets and a real fur snorkel hood (though patches of the fur are missing). Has reflective strips (see odd color strips on front and back) sewed on. Not sure if this was added at the base or later for civilian use. I’ve come across photos of other parkas with the same reflective addition, so I am assuming the was added on base to make ground crew more visible at night. Conmar zipper at main closure and on the sleeve pocket. This particular parka is in pretty rough shape and has some repairs.