A hoop skirt is a type of women's undergarment designed to hold out the fabric of a dress or skirt, creating a bell-shaped silhouette. It consists of a series of flexible hoops made from materials like plastic or metal, which are sewn into the fabric. Hoop skirts were popular in the 19th century, particularly during the Victorian era, and are often associated with styles worn by women in historical fashion. These skirts can vary in size and shape, depending on the desired look. They are commonly used in formal dresses, such as ball gowns and wedding dresses, to enhance the overall appearance and provide structure. Hoop skirts have seen a resurgence in modern fashion, often featured in costumes and themed events.