This vintage jacket was made around 1943, and started off life as an electrically heated CFN-24 flight suit, made with Colvinex metal yarn. It has a wartime Talon zipper with a bell shaped pull and an unmarked deco stopbox. It has a snap throat latch and double snap under collar closure.  These Colvinex suits were popular post-war as motorcycle jacket conversions, as they were extremely well made, durable, inexpensive as surplus, and due to their separable bottom zippers, could be cut down into a jacket style with relative ease.