Here’s a coat from my collection. Not for sale, but an interesting piece.
This flight suit was made in 1942 by the Canadian company Deacon Brothers. Deacon Brothers had a factory at 133 Dundas St East Belleville, Ontario, and was known primarily for their shirts.
It was sold to me as being RCAF issue, as part of a two piece flight suit. The military style designation number seems to point to that, as do all the specialized details on the front. I have only seen two other flight suits of this design, and only a few other items made by Deacon. I have seen one example of this same design made by S.S. Holden Ltd.. Multiple manufacturers producing identical patterns does point to this having been an issued item, but its current rarity points to it not having been made in large numbers.