A corset is a support undergarment worn to hold and train the torso into the desired shape and posture. They are traditionally constructed out of fabric with boning made of whalebone or steel, a stiff panel in the front called a busk which holds the torso rigidly upright, and some form of lacing which allows the garment to be tightened. Corsets were an essential undergarment in European women's fashion from the 17th century to the early 20th century. In the 17th and 18th centuries they were commonly known as "stays" and had a more conical shape. This later evolved into the curvaceous 19th century form which is commonly associated with the corset today. By the beginning of the 20th century, shifting gender roles and the onsets of World War I and II led the corset to be largely discarded by mainstream fashion.

Underwear, underclothing, or undergarments are items of clothing worn beneath outer clothes, usually in direct contact with the skin, although they may comprise more than a single layer. They serve to keep outer clothing from being soiled or damaged by bodily excretions, to lessen the friction of outerwear against the skin, to shape the body, and to provide concealment or support for parts of it. In cold weather, long underwear is sometimes worn to provide additional warmth. Special types of undergarments have religious significance. Some items of clothing are designed as undergarments, while others, such as T-shirts and certain types of shorts, are appropriate both as underwear and outerwear. If made of suitable material or textile, some underwear can serve as nightwear or swimwear, and some undergarments are intended for sexual attraction or visual appeal.