hoop/crinoline means: A full-skirted undergarment that was used for support. The structure of this undergarment is different. You can have a succession of hoops with increasing diameters that reach the hem, starting at the waist. The hoops can be held together with vertical tapes, or sewn to a petticoat. A stiffer fabric may also be used to make the garment. Crinoline is now a common name for such a garment. It was originally made from horsehair and was known as Crinoline. Today, hoops were an important component of the woman’s wardrobe during the 1860s. They are worn underneath evening dresses and wedding gowns. (in Fashion Dictionary)