I think I want to tackle a "gun belt" I was looking for something 1.5 inches wide and fairly thick, around 15 ounces. I think I may order 2 of the heavy leather strips from Tandy and glue them together. Then finish off the belt with a plain stainless buckle.
https://www.tandyleather.com/en/product/heavyweight-natural-cowhide-leather-strips
https://www.tandyleather.com/en/product/heavy-duty-roller-buckles-stainless-steel