A supportive undergarment is commonly referred to as a bra. A bra is an item of clothing that is worn by women to provide support and shape to the breasts. It is usually made from a combination of fabrics such as cotton, spandex, and nylon. The straps of the bra are adjustable and the cups are designed to provide support and coverage. Bras come in a variety of styles, colors, and sizes to suit different body types and preferences.