Don't be put off by the post on Kahrs. I have one, several thousand rounds and not even a hiccup, ever. One of the most accurate guns I own and the trigger is as smooth as glass. Still the Kahr PM9 is just a bit too big for me to pocket carry.
I also have a J frame. Works great in loose dockers. With some pants the but is high enough in the pocket that it can be seen. Still, it's an outstanding classic. Enough said.
I also have the KelTec P3AT; has the 1s generation of that weapon and it was a nightmare. Can't believe it but I got that 1st one back after several trips back to keltec, and traded it in on a 2nd Generation and it's been GLORIOUS. Not a single issue with the new model and I've shot a few hundered rounds of all kinds of different ammos. With the mag extensions that gives me 15 rounds of .380 which isn't too bad. It's a good point and shoot gun, 7-10 yards max. I don't believe theres a more ideal pocket piece if you consider the balance of cost, weight, size, caliber, etc.
Then come the NAA Guardian .380's and the Roughbar R9 which is a true pocket pistol in 9mm but it's $1000.00 and not the easiest gun to get a hold of. I've never held one but its heavier than the ones i've mentioned. If money isn't an issue and you don't mind the weight I'd at leas seriously consider this one.
Beyond that you get into NAA .22 mini revolvers which I think are cute and fun for plinking but I think they're very lacking in the self defense role. Are they better than a sharp stick? Maybe not...
Good luck finding what you need.
God Bless
Gideon