I just got in my new Mercy black polyester kilt in XXL which is about a 42 inch waist. It is just a tad too big so based on the "Just move the buckles" I taylored it down just a bit(2.5 inches). It was within the limits of what needle and thread could do, but in about two hours, I had a hand taylored kilt.

I bet that kilts could be made a little larger with matching tartan material as well.

I see me trying my hand at making a kilt from scratch at some point in the future as I want some things that do not exist (yet).