For true pocket carry, check out the following small and lightweight firearms (depending on what you want to spend):
Ruger LCP, Keltec P3AT, Taurus TCP, SW Bodyguard, Kahr P380, Kahr PM9 / PM40, Diamondback, Sig P238, Rohrbaugh R9 and of course aluminum alloy or titanium J-frame revolvers from SW and Taurus like the SW 642, etc.
There are probably a few more (depending on the size of your pocket) but these are the ones that come to my mind right off the bat.