Factory belt clip on the P3AT. Had one on the 9mm, but it cut meat out of my knuckle shooting Gold Dots, so it's back in the box, along with a factory trigger shoe that is considerably wider than the trigger guard. IWB carry is life threatening.
I sometimes carry the little one inside waist band, next to the belt buckle, using the clip. Invisible even with a tucked in T-shirt, but it does require a push up on the muzzle with the left hand to get a grip with the right. Quick enough with practice. Don't have as much room inside the waistband as I used to though, if you know what I mean.
Mac.