I don’t recommend dressing up pets for Halloween, although some people have luck with it. Most pets, especially cats, don’t like costumes. However, here are some cute videos of cats in Halloween outfits and even one on how to make them yourself. The only costumes Debbie is dressing Harry, Hermione, and Stripey in for Halloween are virtual ones.
Remember to keep your cats inside (indoor cats are healthier and safer all year round) and especially make sure your black cats are safe.