This is a follow-up to my preceding post. I would not have been alone guessing that a horizontal shoulder holster rig (muzzle pointed to the rear) was involved.
Some details on the pistol (.40 caliber Smith & Wesson Military and Police) along with some comments on the “waist holster” can be found HERE (does not say whether it was an inside-the-waistband or outside-the-waistband design. It does say that it was made of a “soft, neoprene-type material”). The investigation still has not put together exactly how this all happened.