A golf or polo shirt, untucked, is all you need. I can conceal a full sized 1911 that way, and a compact gun like a Glock 26 or Glock 43 virtually disappears under such an arrangement. I carry IWB at the 4:00 position.
That said, you should avoid pocket carry. Most of the time when you need your handgun, you need it quite quickly, and you have to be able to go from a relaxed posture to having your hand properly positioned on the grip of the gun pretty near instantly. That's just not possible with pants pocket carry.
Sure, it's a lot better than nothing, but belt carry is a lot better than pocket carry. A lot better.
^^^^THIS^^^^
