燕尾服, or "tuxedo," is a formal suit typically worn for evening events. It features a black or dark jacket with a satin or silk lapel, paired with matching trousers. The design often includes a white dress shirt and a bow tie, making it a popular choice for weddings, galas, and other formal occasions. The燕尾服 originated in the 19th century and has since become a symbol of elegance and sophistication. It is commonly associated with high-profile events, such as the Academy Awards and formal dinners. Wearing a燕尾服 signifies a dress code that emphasizes refinement and style.