More Words, Deeper Hole

Well, I don't absolutely draw the line against things like "Thunderwear", though I haven't used them myself. But those are designed to retain and position a gun, and keep the trigger covered. Just stuffing a gun in your waistband seems like a bad choice, yeah. In fact, even "the training that comes in the box" often manages to find space to recommend against that.

(I personally recommend against guns with an external safety device, and in favor of carry with a round in the chamber though, if you're going to carry at all. Modern guns with trigger-linked safety devices don't need additional manual safeties, and it's just one more thing to go wrong, an extra complexity, can easily be nudged "off" leaving you counting on something that is no longer there, and generally seems like a bad idea. Old-fashioned single-action autos don't in my opinion fit modern civilian carry at all well; I strongly prefer revolvers or modern semi-autos designed for carry.)