Depending on the pants, a Ruger SP101 or SIG P229 SAS. Yes, you read that right, SIG P229 SAS, the one with the "melt" job done to the slide, and with a bobbed hammer. But then, I don't use pocket carry for general carry, just for taking out the trash, or perhaps to walk the dog around the block.
If I wanted to make a habit of pocket carry, I would use one of the several J-frames about the house, with preference given to the Centennial models, with the concealed hammers. A Seecamp LWS-32 could back up the J.