It's sort of a long story. I got really irritated at the lack of Kydex appendix carry for Colt D Frames and spoke with somebody at Colt / CZ. They turned me onto Craft Holster, a Slovakian company, and we arranged to have a couple Colt D frame appendix carry holsters made to my requirements....one for older Colt D Frames and another for 2017 - Present D Frames (the trigger guard is different). They are great. However, I had to add the DCC clip myself. I am so happy with the product that we are making two more AIWB holsters...one for 2" K Frames and another for 2.5" Model 19/66. Should be here in about a month.
For J frames...Forged-Tec makes the best J Frame AIWB holster, in my opinion. The PHLster City Special is nice too, but I strongly prefer a DCC clip over the cylinder than a single hook close to the wing/claw.
Here's the Forged-Tec for J Frame.