What is an underwire bikini?

An underwire bikini is a type of swimsuit that features a wire or other supportive structure built into the cups of the top to provide additional support and shape to the bust. Underwire bikinis are often designed with larger cup sizes in mind, and can be found in a variety of styles, including one-piece swimsuits and two-piece bikinis. The underwire can be made of metal, plastic, or other materials, and is designed to help lift and support the bust, providing a flattering fit and shape. Underwire bikinis are often considered to be more supportive and figure-flattering than non-underwire swimsuits, and are popular among those who want additional support and shaping for their bust. They can be found in a range of colors, patterns, and materials, and can be adjusted for fit or tied in different ways to create different looks.