There are a few things you can do to get your belt to lay flat. The first is to try a different size belt. If the belt is too big, it will bunch up and not lay flat. The second is to make sure the belt is tight enough. If the belt is too loose, it will also bunch up and not lay flat. The third is to try a different style of belt. Some belts have a tendency to bunch up more than others. If you try all of these things and your belt still doesn't lay flat, you may need to get a new belt.