There is a small private leather shop in Ohio Amish country - Coblentz Collar in Millersburg - that makes belts from thick bridle leather.
These are single thickness belts, not multiple layers stitched together, and will last a lifetime. I have one each in brown and black and use these exclusively for my IWB CC. The last price I paid was less than $40 apiece.
If you call them, they can make these to your specs if so desired; smooth, embossed, etc.
I’ve bought other leather pieces from them, including a custom-made bison leather wallet. Everything is top-notch quality.
Family owned and operated and great to do business with.