If you are interested in appendix carry without the pinch, get a quality holster. I just got a JM Custom Kydex holster with a claw and a pad. The fit and finish is great. The pad makes a world of difference with comfort.
@anon25963094 taught me a bit about adjusting your holster and belt in a very discreet way to maximize comfort while sitting and moving. Loosening your belt a touch will make the pinch go away, same with pulling up your pants and holster a bit before sitting down. Chris got me on the appendix carry train in about a week and I have never really looked back. I believe it is not only faster on the draw, but that technique will make a bigger gun disappear really well.