Tuxedo describes a coat pattern, not a breed: a bicolor cat, usually black and white, with a white chest that looks like a shirtfront and often white paws, chin or a facial blaze. Grey-and-white tuxedos exist too. The pattern comes from white spotting variation in the KIT gene, which limits where pigment cells reach during development. Because the gene is not sex-linked, male and female tuxedos are about equally common, unlike calicos.
Most tuxedo cats are domestic shorthairs, though the pattern also appears in breeds such as the Maine Coon, British Shorthair, Persian and Scottish Fold. Stories about tuxedos being especially smart or bold are fun but unproven, since color does not set personality. Adopters will meet every temperament and energy level, and the individual cat's history matters most when choosing a companion.