Organza is a type of lightweight, sheer, and plain-woven fabric that is traditionally made from silk. However, many modern organzas are woven with synthetic filament fibers such as polyester or nylon. Organza is characterized by its crisp hand, stiffness relative to weight, and slippery surface texture. It is a very versatile fabric that is commonly used to make garments that overlay thicker types of apparel, and it is also occasionally used to make a variety of different types of household textiles. Organza is a plain weave fabric, and both the warp and the weft threads are the same size, and they have the same number of picks per inch as ends per inch. Since organza is so lightweight, its quality is measured in terms of holes per inch (HPI) rather than thread count. Organza is used for bridalwear, eveningwear, and day-to-day clothing. It is also used in the interiors market for effects in bedrooms and between rooms, and double-width organzas in viscose and acetate are used as sheer curtains.