Some people consider a gun that somehow can fit into a pocket as a pocket gun. I don't. Some people also walk around town wearing pants with cargo pockets, which I don't. To me, a pocket gun is one that will fit in normal pants pockets, and which permits the user to obtain a full firing grip on the gun while looking very natural.
I have a DeSantis pocket holster for the XDS, and the gun and holster will barely fit in a pair of Levi's. But, I do not remotely consider that gun to be a pocket gun. It is not easy to get a good firing grip without looking weird. It is very hard to draw, and it snags. Don't know about the Shield, but it looks too big to me. Same with the Glock 26/27 sized guns.
