Seen a few at the War & Peace show, also other country variants, one dealer had rail full of them but not sure of which country, maybe Dutch or Belgiumicon ?? I mentioned in another post about about an Army Navy store in Liverpool when I was kid, it had about 5 floors all packed to the gunnels with all types ex surplus clothing lots of Greatcoats, Army, Navy, RAF... Like others have said more often worn for work wear etc.

I don't think they will be too hard to find, have a look on ebay, WW2 dated ones will be a lot more than a post war one.