I carried at a Better than Ezra concert about 10 people deep into the crowd Friday night. Nobody had a clue I had a gun. Not the cops all around, not the people jumping around me, not when I had to get the guy off my wife who was trying to take the free t shirts that landed in her hands. I was wearing jeans and an untucked button up shirt, but I regularly wear the set up with a Tshirt without problems.
The key, A quality holster and quality belt. The gun didn't budge the 7 hours we were out there.
BTW I was carrying a 3914 @ 4 o'clock in a holster I made myself on a belt I made with an extra mag in my left pocket, Kershaw blur in the right along with a Fenix LD10.
My Daily carry is an M&P pro, but I broke out the smaller gun for the concert, it doesn't budge at all, I carry it in a pancake OWB under a T shirt, again, I made it myself so I have it ride a little high with an FBI can't at around 4, sometimes @ 2 if I am about to shoot a match and I have been practicing with a competition rig. I would have more problems with my cardiovascular system failing before I would have to worry about my gun shifting.