I agree with bubba. Stillwater Kilts has cheaply priced kilt belts. They are real leather, wide, thick, and stiff. They come with a real cheap buckle but are a great choice for an inexpensive kilt belt. You can see a picture at their web site. They have some at their ebay store.

Here is what one looks like actually on a person.

I would get a better buckle, but I don't wear my tartans as much as my solid colors.