Skirt insert is a type of clothing construction technique used to add volume and shape to a skirt. It involves inserting a GORE, HOOP, godet, or setin into the skirt. A GORE is a triangular piece of fabric that is inserted into the skirt to create a flared shape. A HOOP is a circular piece of fabric that is inserted into the skirt to create a bell-shaped silhouette. A godet is a diamond-shaped piece of fabric that is inserted into the skirt to create a fuller shape. Finally, a setin is a rectangular piece of fabric that is inserted into the skirt to create a pleated look. All of these pieces are sewn into the skirt to create a unique shape and style.