The change pocket might work fine for a standard KISS- but then, there's really not much of a problem concealing a knife of that size. As noted elsewhere, I was hoping to find an inconspicuous carry for something a bit larger.

One thing I've been thinking of- instead of sewn "tunnel loops" etc., maybe just a single piece of, say, 9 oz leather or perhaps eighth-inch polyethelene, with edges cut something like the bottom half of a backwards "D" (to fit the shape of the bottom of a typical front pocket). Just thinking, but a typical clip folder could then be clipped to the top edge of the "insert" and it would ride out of sight, but stable and away from the grit that accumulates in pocket bottoms. I don't know what would be required to retrieve it one-handed, but it might be worth a little experimentation. Hmm...