Hard to beat a j frame but they are kind of large for pocket carry in jeans. There are lots of holster options to make that easier, you want one that blocks the front profile of the gun so it doesn't "print" in the pocket. I've tried a bunch and found the Mika pocket holster to work the best for me. The gun comes out of it easily and it just looks like I'm happy to see you instead of saying gun in the pocket. I also like the Kahr PM9 but seldom pocket carry it since I can hide it better in an appendix carry holster David E made for me.
I've tried most of the 380's and of those, the Kahr P380 is the best trigger, sights, etc. I kind of decided I can hide the j frame or PM9 about as well as the 380's and I'd rather have a 9mm or .38/357 instead of a .380. I also have a tiny North American Arms PUG .22 magnum that I carry when I can't carry a real gun. It's a slick little 5 shot derringer type revolver that will be better than a sharp stick if I get caught out somewhere I need a get off me gun.
Whatever, you get, you need to practice with. David let's experienced shooters draw from a pocket at Heartland. I found out how really slow pocket carry is when I tried it with a snubby. But.....you can shoot from your pocket like this: http://www.youtube.com/watch?v=cQrOsMjAVEQ&list=UUMEqfzg9ZVgRhs66huDm8-Q&index=2&feature=plcp