What is a "fancy dress"?

Fancy dress refers to a costume or outfit worn for special occasions or events, often for parties or Halloween. Fancy dress costumes can be based on a wide range of themes, including historical figures, fictional characters, animals, and more. These costumes can be elaborate and detailed, often including accessories such as hats, wigs, and makeup. Fancy dress is often used to create a sense of fun and playfulness at social events, allowing individuals to express their creativity and imagination through their clothing.