Had an old ww2 1911 .45, loved that piece. Had one in the pipe and it was on half cock safety. I went to slide it in my waistband and it went off sending the hollow point .45 slicing thru my hip. Had a gunsmith go over the gun, there was no impact point on the primer of the round, the action didn’t cycle indicating that the slide had been pushed far enough back to rob the system of the needed power to cycle the action. The primer showed an outward bubbling from heat. The gunsmiths opinion was a touchy primer, the action of sliding the gun in the waistband moved the slide back that caused enough of a flat impact on the primer to set it off. Rule learned, keep the pipe clear at all times till you want to shoot.
No one recommends carrying a 1911 that way. Cocked and locked.