What describes a bustier?

A bustier is a form-fitting garment designed to support and enhance the bust. It typically features structured support, often incorporating boning to help shape the torso and provide lift. Bustiers are usually constructed from fabrics like satin, lace, or cotton blends, and they may include features such as cups, underwire, or hooks for closure. Their close fit and design make them popular for both lingerie and as outerwear pieces that can be styled with high-waisted skirts or pants.

The other descriptions do not accurately reflect what a bustier is or its primary purpose. Casual outerwear would typically refer to garments that are not form-fitting and are designed for comfort rather than support. A loose-fitting summer dress suggests a relaxed silhouette, which contrasts with the tailored shape of a bustier. Swimwear encompasses various styles suited for water activities, which is distinct from the supportive and structured nature of a bustier.