Tuxedo isn't a breed. It's a bicolor coat, usually black and white, with a white chest that looks like a shirtfront and often white paws, chin or a facial blaze. Some are grey and white. The pattern comes from white spotting in the KIT gene, and because it isn't sex-linked, male and female tuxedos are about equally common.
Most are domestic shorthairs, though the pattern also turns up in breeds like the Maine Coon and Scottish Fold. Weights run roughly 6 to 14 pounds, and many live 12 to 18 years, so adopting one is a long commitment through a lot of snowy winters. Tales of tuxedos being smarter or bolder are fun but unproven. Color doesn't set personality, so each cat's age, energy and history matter more than its markings.