I carry my 642 IWB in a Side Guard Holsters Quick Clip leather holster. I have carried in my pocket using a DeSantis Nemesis, but it was too bulky for my tastes. I've thought about trying one of the kydex pocket holsters for the thinner material, but I prefer IWB carry so the need to try one isn't really there.

FYI, I wear jeans probably 99.9% of the time. The kind of pants/shorts you wear, and what kind of pockets they have, can affect how well pocket carry will work for you, as well as the type of pocket holster used.