Well, I just need between 1.5 and 2 inches smaller on the waist - at the moment if I buckle it up to the tightest holes, it'll sit on me properly as long as I don't do anything more than shuffle at a very measured pace, so it doesn't need to go too much smaller.

So the SWK has two buckles on the right, of which one is on the waistband, and one on the left, where a strap goes from the underapron through the waistband and then through the buckle. The straps on the right are behind the front flap of the apron. The one stap and buckle on the left I think can't really be moved due to the way the strap goes through the waistband.

I'm trying to picture this, but my 3D conceptualisation isn't all that hot. Assuming I was wearing the kilt, then I think the straps on the right would need to be moved towards the left, so when I pulled the straps through the buckles it would be tighter. I can't really picture what to do with the buckles, though.

And, as much as it would be handy for me to know how to wield a sewing machine, I have absolutely no idea how, and absolutely no experience, so I've been asking around for trusted tailors and have gotten a few down. It's just that I don't know if any of them would have done this before, so I'd like some clear instructions, or else it may a case of the puzzled leading the confounded.