The Matrix is a science fiction film franchise created by the Wachowskis. The first film was released in 1999, and the franchise has since expanded to include two sequels, comics, video games, and more. The Matrix costume is an outfit designed to resemble the appearance of one of the characters from The Matrix franchise, such as Neo or Trinity. The Matrix costume is a classic sci-fi costume for Halloween. If you are thinking of a last-minute costume idea, then this is it!