Down jacket woman's vintage

A vintage down jacket from the 1948 sold by the Alaska Sleeping Bag Co. The jacket is in great condition showing little wear. It is labelled size 16 but fits like a slim medium. It measures 20" across the chest from bottom of armhole to the other, the bottom edge measures 21" across the front. the sleeve circumference is 11.5 ". the center back from neck to hem 25". The armhole circumference is 22". The jacket is made of cherry red canvas stuffed with down. The metal zipper has two sliders.