Wikipedia defines a belt as:
A belt is a flexible band or strap, typically made up of leather or a heavy cloth, and worn around the waist, which is usually of less circumference than the hips underneath, preventing pants from falling. Belts are used to secure or hold up clothing, like trousers or other articles of clothing, in a manner similar to suspenders and garters. Some trousers come with belt loops around the waist, which the belt goes through. Belts can have many uses, but they are often used as a fashionable accessory, with many colours and styles. Objects to carry objects such as coin purses, holsters, scabbards, etc. have been attached to belts in lieu of pockets.