Everyone has an opinion on IWB holsters, but I think the material from which they are made should be as THIN as possible to enhance concealment.

I recommend Paul Giannaula at PJ Holster. Ask for one of his IWB holsters with the so called clip on belt loop. It is not the old type of metal clip that allows the holster to come out with the pistol upon presentation. Instead, it has a curled in portion at the bottom that positively hooks on the belt, yet is easy on - easy off.

IWB Clip on Belt Loop | PJ Holster LLC