What is swallow tailed coat?

A swallow-tailed coat is a type of formal coat worn by men. It is characterized by its long coat-tails that are split in the back to form two projecting tails. It is typically made of black or dark colored wool, and is worn with formal attire such as a white wing-collared shirt, black trousers, and a bow tie. It was originally designed for horseback riding, as the tailcoat's split in the back allowed for ease of movement while riding. Today, it is commonly worn by grooms at weddings, orchestra conductors, and in high-end formal events.