I have two black and one brown kilt belts that have the size adjustment on the inside with velcro. After the initial messing around to get it to fit with a particular buckle they work fine, with only needing to adjust them when I change buckles.

I have one old belt that has a buckle on the inside instead of velcro. The velcro is slimmer and more adjustable and more comfortable.

I like the velcro adjustable belts.