What is an "underskirt"?

An underskirt is a garment worn underneath a skirt or dress to add volume and shape to the outer garment. It is typically made from lightweight materials such as cotton or nylon and may have additional features such as ruffles or petticoats to create a more dramatic effect. Underskirts come in many different styles, including those that are full-length or knee-length, and those with or without hoops or wireframes to hold the shape of the skirt. They are commonly worn for formal or special occasions and can be paired with a variety of different skirts and dresses to achieve a desired look.