Full dress refers to the clothes that people wear on special occasions like weddings, parties, or ceremonies. It usually means wearing really fancy clothes, like a suit or a fancy dress, and nice shoes.
Men's full dress usually involves wearing a jacket, called a tailcoat, that has a long narrow part at the back called a tail. They also wear a white shirt, a tie, and dress pants. They usually wear black shoes that are very shiny and clean.
Women's full dress can be different depending on the occasion, but it usually involves wearing a fancy dress and nice shoes. Sometimes the dress can be long and flowing, or it can be short and poofy. Women might also wear jewelry and other accessories to add to their outfit.
Overall, full dress is about dressing up in your fanciest outfit for a really special occasion. It's a chance to feel extra fancy and look your best.