Welcome to the forum, Kitty!

Your boyfriend is correct in thinking that he'll need more than a wimpy 1.5-inch wide belt for his new kilt. A manly garment like a kilt needs a manly belt!

Typically, kilt belts range from 2 to 3-inches wide with 2.25-inches being the most common. It sounds like your boyfriend's kilt in in production, now, in which case the best course of action would be to ask whoever is making his kilt how wide of a belt will the beltloops accomodate. And if your boyfriend is getting a traditional wool kilt, I'd recommend getting a lined belt, it kinder to the kilt.

There are many providers of quality kilt belts. Here's a couple of examples -
http://www.morrison-sporrans.co.uk/k...ilt_belts.aspx
http://www.journeyman-leather.co.uk/kiltbelts4.htm

.