A pleat is a fold in fabric that is typically sewn or pressed into place. It creates a structured look and adds volume to garments or textiles. Pleats can be found in various clothing items, such as skirts, dresses, and trousers, and are often used in home decor, like curtains and tablecloths. There are different types of pleats, including knife pleats, which are all folded in one direction, and box pleats, which alternate directions. Pleats can vary in size and depth, influencing the overall style and fit of the item. They are a popular design element in fashion and upholstery.