There is an almost universal mistake I see when people are trying to buy a gun belt; they think leather= good gun belt. It doesn't.
There are good leather gun belts out there. The problem with leather, any leather, it that as it ages, it softens. When it softens, it doesn't support the gun as well as it should. This creates pain when carrying because the weight of the gun isn't spread out and focuses on one point.
There are no absolutes in life, but for me, I'll only use a gun belt that has a polymer (or other stiffener) liner that won't break down. My Uncle Mike's Instructor belt is as stiff today as the day I bought it at least 5 years ago. I think I only paid $25 for it.
I've recently discovered
Kore Gun Belts. These always fit properly, aren't too expensive, look nice and not "tactical" and have a polymer liner so, they're stiff. I really like these and highly recommend them.