Where can one get ideas on how to make homemade cat costumes?

Try wearing all black (or whatever color you want your costume to be), paint whiskers on your face, and find some ears to put on your head, (they look like crowns with ears). And That'll be a convincing outfit.

Try any costume store a good one. Why not some of the more exotic cats such as a Black Panther, various species of Tiger (including Siberian and Grey) and so on. As the holiday has a Black Cat backdrop, why not appropriate and slinky, yet beautiful cat costumes. Even Poe acknowledged the sinister Black Cat was a most beautiful animal. If you have a pet cat, a good artist"s model. There have been Panther sightings- up to five feet long in New Jersey recently- not the sixties Black Gang, but the animals.