What Spanish phrase commonly names the formal dress worn for a quinceañera?

The formal dress worn for a quinceañera is commonly called a vestido de quinceañera.

In Spanish, vestido means “dress,” so vestido de quinceañera directly means “quinceañera dress.” The outfit is usually an elaborate formal gown selected for the celebrant’s fifteenth-birthday celebration and may include a full skirt, decorative details, and coordinated accessories.

The dress is often compared with a bridal gown because both can be formal and traditionally elaborate, but they serve different ceremonies. A quinceañera dress marks a coming-of-age celebration; it does not signify marriage. Styles vary widely according to family preference, region, religion, budget, and contemporary fashion.

English-language sources may also call it a quinceañera gown or simply a formal dress. Those descriptions refer to the same general garment, while vestido de quinceañera is the straightforward Spanish phrase.