I also have one of the Oconee Leather Works belts (black, 3" wide, knotwork tooling) and it is great.

There are a number of vendors out there that sell belts like you are talking about.

Amerikilt offers just what you are talking about. Leather, 2 inches wide, square buckle. $38.
http://www.amerikilt.com/shop/belts_buckles/leather/

The "Pirate Belt" from Ravenswood Leather has a good look and is available in a couple of widths, a variety of colors, and also offers various decorative elements, if you are so inclined. Price $50-55, depending on width (plus cost for any add-ons you may want)
https://ravenswoodleather.com/belts_...e_belt_3_wide/

For a more budget approach, do a search for "tactical" belts and you'll find some wide, sturdy belts designed for police and security officers to hang their gear from. A visit to your local hardware or home improvement store will likely provide you with a choice of tool belts that are also sturdy, wide, and simple in style. Both of these alternatives can also look great with a kilt.

Happy hunting!

Andrew