Standard advice is to have a wider belt for jeans, at least 1 1/2 inches. However, I noticed that people seem to be doing this less and less?
Can you pair formal leather belts normally worn with trousers with jeans, if you're wearing good leather shoes? What about jute/cloth belts? (Lots of people are wearing canvas belts that look like military surplus belts in my area now).
Or should you just stick to a nice wide belt with a good buckle?