There are a few ways that you can make a homemade cat costume! One option is to take a black long-sleeved shirt and leggings and add some felt triangle ears to the top of a headband. You can also create a tail by stuffing an old sock with cotton balls and safety pinning it to the back of your child's clothing. For added effect, put some black makeup around their eyes to make them look like they have whiskers. If you want to get really creative, you could even make a cardboard box into a makeshift litter box - just be sure to cut out holes for your child's arms and legs!