A bodystocking is a one-piece skin-tight garment that covers the torso, legs and sometimes the arms of the wearer. It is a foundation garment or an article of lingerie usually made from a sheer fabric similar to that used for stockings or pantyhose, or from fishnet, lace or an opaque material, or a variation of these materials. A bodystocking differs from a unitard, which is worn as an outfit or article of clothing, and a leotard, which is used as a practice garment or performance costume by acrobats, gymnasts and other similar performers. Designed to be revealed, but not to be too revealing, bodystockings may be worn as undergarments by performers such as belly dancers and exotic dancers. Bodystockings were used on stage in at least 1860s. In 1861, American actress Adah Isaacs Menken controversially wore a flesh coloured bodystocking on stage, to preserve her modesty and stay within the obscenity laws, while giving the illusion of nudity. The unitard is a variation of the leotard that also covers the legs and sometimes also has long sleeves, and which is considered to be a combination of a leotard and tights. It is similar to a bodystocking, but is designed as outerwear, for view by the general public. A bodysuit covers the torso, crotch, and sometimes the legs, hands, and feet. The style of a basic bodysuit is similar to a one-piece swimsuit and a leotard, though the materials may vary, and a bodysuit, unlike a swimsuit or leotard, has snaps, hooks or velcro at the crotch. A bodysuit may have sleeves and varying shoulder strap and collar styles. Bodysuits can be made from a number of fabrics, including cotton, lace, nylon, etc. In general, textile bodysuits include expandable fiber such as spandex for a better fit to the shape of the body. A bodysuit is normally worn with trousers or a skirt, exposing at most the top of the garment above the waist. The top, torso part may act as a top for the smooth line it gives or because it cannot become untucked from trousers or skirt. They may also be worn generally by women as underwear, activewear, or foundation garments. Unlike a leotard, a bodysuit is not usually considered a form of athletic wear. The purpose of the opening at the crotch is to facilitate access during a visit to the toilet.