The Tuxedo Mask costume is a popular costume. It features the character Tuxedo Mask from the Sailor Moon series of books and movies. It is typically worn by men or boys.
A couple can dress up as a Tuxedo Mask / Sailor Moon combo, while a group can go as the entire Sailor Soldiers with Tuxedo Mask as their ally. A mother / father / daughter trio could also go as a Tuxedo Mask / Sailor Moon / Sailor Chibi-Moon group.