Stretching your leather belt allows you to keep it for a longer period of time and still enjoy its fashion benefits.
Add a hole to your belt with a leather punch. Look at the location of the holes on your belt, and note where you desire to insert a new hole.
Add three cups of heated water and one cap of rubbing alcohol to a plastic spray bottle and shake it up. Spray the entire belt, and place the belt around your waist as you normally would when you wear the item. Wear the belt in your home until it is no longer wet.
Alternately, you can buy a chemical solution at your local shoe shop. This mixture will cause the collagen in your leather belt to deteriorate and cause your belt to elongate. Use this chemical shoe stretcher in the same way that you would use the alcohol to perform its function.
Purchase a conditioner at a leather goods store to use on your belt. Read the labels of the products in the store and find a conditioner that contains lanolin, so your trousers and shirts will not stain easily.