I'm uncertain on the nomenclature, but I occasionally use 2 original issue holsters for my Hi Power:
-A 1940's vintage British Army khaki issue canvas flapped belt hanger holster;
-A more recent, if not still current British Army olive green "double flap" canvas holster.
To the amusement of many, after losing a bet to a Scottish IDPA member (and former British Army officer), I actually competed in an IDPA match with the British Army "double flap" holster-my times set no land-speed records, but with some practice, the draw was fairly quickly accomplished.
Best, Jon