Special occasion is the market category within the fashion industry that encompasses the more formal side of attire, including after-five dresses and suits, formal attire, and evening-wear. It also includes the bridal industry, which consists of clothing worn by the bride, bride's maids, grooms, ushers, ring bearers, flower girls, and the father and the mother of the bride and groom.
Historical Dictionary of the Fashion Industry. Francesca Sterlacci and Joanne Arbuckle.