Vintage 1940s RAF Canadian SS Holden? Pilot Aviation Flight Suit

Vintage 1940s WWII Canadian SS Holden? Shearling Insulated Flight Suit **cannot 100% confirm/identify this suit, as the tags have been removed** high altitude, heavy full flight suit, similar to the Canadian S.S. Holden suits. In excellent vintage condition - virtually no flaws to note, regular wear as expected, color differences etc. Working zippers, no rips, some small stains approx. measurements laying flat INSEAM 26" FULL LENGTH 58.5" PIT TO PIT 24"