Sizing for a Utilikilt?

[Joshua of Blackwood]

Hey, I know this is a pretty stupid question, and I hope you can forgive me, but...

What is the proper sizing technique for a Utilikilt? As in, where should I measure for the waist? I have done some research, and traditionally for a kilt, you measure about 1 1/2" to 2" above the hipbone, or at navel level, from what I can see. However, Utilikilts are apparently supposed to ride much lower. Their diagram isn't terribly helpful, or maybe it's just that I've been up all night. They seem to want you to measure over your jeans, at roughly hip level. Is that correct?

See, the thing is, I've found a Utilikilt Workman's model on eBay for a monstrously good price, and it's a 32". I wear from a 30" to a 32" in jeans, and my measurements fluctuate between the same depending on where I measure. The auction ends in about 10 hours, and I'd like to know if I should grab it.

Also, if it was say an inch too big, would that be a big deal? Gah, please forgive my newbishness! I've wanted a kilt for years, and I'm finally to the point where I have the money to get one. I've done a lot of research, and I think this is the model I want, anyway, but to get it at full-price I'd have to save up another month.

Help! Thanks in advance! (and yes, this question finally made me join—I've been lurking off and on for over a year)