Elastic belts are free size and normally don’t tear at all. meaning they can last for life.
I am kind of surprised that they are not commonly recommended in the anti-consumption/ buy it for life communities. Despite the fact that replacing normal belts with them at scale would save the world shitload of resources that are spent on normal belts annually.
Side note: I don’t recommend wearing jeans or suit trousers on daily basis, as there is more durable options that can last for longer time.
Photo is for example, as this is a generic item.
Best advice is to learn how to identify real leather vs laminated shit. Once you can tell by sight, smell, feel you can thrift great items. Also going to markets and craft fairs, you can stumble across artisan leather makers (but even then you gotta make sure they are using quality products)