I can recommend PCS or Pocket Carry Systems holsters. Their leatherwork is excellent and their designs are extremely effective. You can find them at
http://www.pcsholsters.com.
Note what kind of pants you will be wearing when you carry. If you're wearing dress slacks or "Dockers", you'll want a holster that cants the butt of the gun forward, or into the pocket. Without this, the gun butt will show every time you sit down, and sometimes when you're just walking. If you're going to be wearing jeans or something with top entry pockets, you'll want a holster with a straight drop or it's hell to draw the weapon. I carry a BUG everyday in on of these and have for several years.
Our own "Uncle" Lou Alessi and Josh Bullman also have some pocket offerings, I just don't have any first hand experience with them. However knowing these two gentlemen, they are no doubt "top drawer" quality.
Mark