A belt is a flexible band or strap, typically made of leather or heavy cloth, and worn around the waist. A belt supports trousers or other articles of clothing. It is an item of accessory. Wikipedia
Types of belt
Casual belts are simply what the name implies. They are to be worn on simple outfits like jeans and shorts. The types of leather used in the casual belts are usually rugged and matte. The designs are often broader, tougher and made with interchangeable buckles.
Formal belts are more formal. It often has a small frame-style buckle, simple designs, and neutral colors. When wearing a dress belt on a cooperate outfit, it is important that the shine of the leather corresponds. i.e. the high shine belt should be worn with the high shine shoe.
Rules to abide by when choosing a belt