Corset, article of clothing worn to shape or constrict the waist and support the bosom, whether as a foundation garment or as outer decoration. During the early eras of corsetry, corsets—called stays before the 19th century and made stiff with heavy boning—molded a woman’s upper body into a V-shape and flattened and pushed up the breasts. Some were attached to petticoats or could be fastened to them in order to preserve a flat shape at...