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Bustier - Wikipedia

A bustier (/ b uː s t ˈ j eɪ /, alternatively bustiere) is a form-fitting garment for women, which is traditionally worn as lingerie.Its primary purpose is to push up the bust by tightening against the upper midriff and forcing the breasts up, while gently shaping the waist. Nowadays, it might also be worn as a push-up bra under a low-backed dress, or as a camisole for outerwear.