A bustier is a form-fitting undergarment that supports and shapes the bust. It typically has boning or underwire to provide structure and can be made from a variety of materials, such as lace, satin, or mesh. Bustiers are often worn as lingerie, but can also be worn as outerwear, paired with a skirt or pants.
Bustiers have been worn for centuries, and their popularity has waxed and waned over time. In the 18th century, bustiers were worn by women of all social classes as a way to achieve a fashionable silhouette. In the 19th century, bustiers became more elaborate and restrictive, and were often worn with corsets to create a tiny waist. In the 20th century, bustiers became more comfortable and less restrictive, and were often worn as lingerie or swimwear.