In last few years, we have seen a new form of handgun holster come into common use—the pocket holster. For the purposes of concealed carry, the pocket holster can do a lot.
There are several types and they work as the name implies. They're holsters for small handguns that fit into (usually) trousers pockets. In use, the shooter reaches into the pocket and grabs the butt of the gun, which extends up and out of the holster, but still inside the pocket. When the shooter lifts the gun, the holster stays in the pocket because of an edge, corner or extension on the holster that contacts the upper corner of the pocket and keeps the holster from coming out with the gun.
Some makers also use sticky or coarse material on the outside of the holster to help keep it in place. These little folded-over pockets of cloth, leather or synthetic material work surprisingly well and are usually less expensive than more conventional holsters
Their best single advantage, however, is the efficient way they break up the obvious outline of a gun showing through the thin cloth of a pair of today's lightweight pants. Pocket holsters hold a gun in readiness and they don't allow it to "print" to the world.