A couple of my old duty belts are two-part. The outer belt is lined with velcro loop, and the inner belt is faced with velcro hook. No buckles. In use, the inner belt goes through the belt loops, with the velcro side out. The outer belt--velcro side in--is applied over the loops and inner belt. No belt keepers necessary. I have one leather set and one nylon.
The point here, tho, is that you can turn the inner belt with velcro side in, and wear it by itself as an off duty/ ccw gun belt. With the velcro in lieu of a buckle, it is infinitely adjustable. I wear the nylon for every day, and the basketweave leather for goin' to town. I have a couple of IWB holsters with velcro tabs (by Ted Blocker, IIRC) instead of loops, which work just great.
