Tuxedo describes a coat pattern, not a breed: a bicolor cat, usually black and white, with a white chest 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, and because it isn't sex-linked, males and females are about equally common.
Most tuxedos are domestic shorthairs, though the pattern also turns up in breeds like the Maine Coon and Persian. Weights run roughly 6 to 14 pounds, and many live 12 to 18 years, so adopting one is a long commitment. Shedding is moderate, and a weekly brush keeps fur off the sofa in a Plano apartment or house. Stories about tuxedos being smarter or bolder are unproven, since color doesn't set personality.