Until the Second World War, gentlemen were expected to wear dinner jackets in the evenings.
Since then, the designs have extended into blazers, tuxedos, and dinner jackets.
This includes a black tuxedo (white dinner jackets are sometimes permissable), black shoes, a white shirt with pleated or ribbed front, a cummerbund and bowtie.
Still, when necessary, men did dress in black, double-breasted dinner jackets (previously considered extremely informal and even offensive) and matching ties.
Both the male and female dinner jackets are fully lined and have removable Navy gilt buttons.