A supporting 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 typically made from a combination of fabrics such as cotton, spandex, and nylon. Bras come in a variety of styles, including push-up, strapless, and full-coverage. They are designed to provide comfort and support while also enhancing the appearance of the wearer.