Given the current contours of my body (sigh), I've given up on IWBs. As Michael Bane said on the TEEVEE, with the right cover garments you can wear an OWB fairly easily. So I do and cover my Glock 26 and an extra mag. Thus, I get 11 rounds and a reload.
I also found - and this might be because I'm left handed that IWB holsters tend to release the mag on a semi. I notice that the trigger guard cover would flex enough to press it. Happened with Glocks and a 1911.
That being said, the J frame in the pocket works for me. I've found the 26 too large for easy pocket carry but I've done it in cargo pants.
Pocket Js work for moi but an LCP does also but as a BUG.