most of the kiltmakers have instructions on there website
I'm asking because I followed the instructions to a "T" and the kilt was too big. Same with AK. We got a 38" waist as per instructions and had to exchange for a 40" (which fits perfectly). After my AK I bought a UK 40" waist and it's an inch too big (so I'm a 39" in UK)--I'll wear it because it works with a belt...

My experience so far is that sizes are all over the map. So let's make a map!