Gap fillers are a type of clothing item that are designed to bridge the gap between two pieces of clothing. The most common type of gap filler is denim, which is a sturdy cotton fabric with a twill weave. Denim is often used to fill the gap between jeans and other clothing items such as skirts, shorts, and jackets. Denim is also used to create a variety of fashion accessories, including belts, bags, and hats. Denim is a versatile material that can be dyed in a variety of colors and styles, making it a popular choice for many fashion-conscious individuals.