Unfasten your trousers, lower what has to be lowered and rebuckle your belt with the buckle tongue in the
first hole, take care of business (spreading your knees apart will hold your trousers off the floor), rearrange your trousers etc, rebuckle the belt tight and away you go. If you have a quality holster there should be no problem of the pistol falling out while you are occupied, as it were.
Do not unholster your pistol and hang it on the coat hook. Story in point. P/O armed with a 1911A1, enters stall, hangs said 1911 on the coat hook and by accident disengages the thumb safety. After taking of whatever he had entered the stall to do, he grasps the 1911 and lifts upward, the thumb safety was not engaged and now the grip safety is depressed, trigger hits hook, very loud noise, P/O jerks back and the trigger returns to the forward position, another upward lift and a second very loud noise. This occures for a couple more times (he being a slow learner and still somewhat surprised) until he just lets the pistol hang
and very carefully starts over.
Kids, don't try to do this at home. (or anywhere else)
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Ne Conjuge Nobiscum
"If there be treachery, let there be jehad!"