The next part of building your costume is making your front and back paws. This part usually isn't too hard except for finding what you need. After you found everything, it's pretty easy. Queens will either have regular arm warmers, opera glove-type arm warmers, or no arm wamers at all. The regular arm warmers will be prepared in the same way as the leg warmers. The opera glove-type arm warmers can be made from long, elegant-looking gloves. If your costume involves this type of arm warmer, make sure it's a glove that you can part with, not your grandmother's best gloves. Cut off the fingers, but leave the part that goes right in between the fingers in-tact. Take fabric paint or fabric markers (you're certainly getting a lot of use out of those fabric paints, aren't you?) and create the patterns used for that particular cat.
Toms usually wear regular arm warmers, the ones that are like the leg warmers. These will be prepared in the same way as the leg warmers. some of the toms also have little gloves on their hands. To make this, you just take a pair of old gloves, in the color you want, and cut off the fingers, much like you would with the opera gloves. Some of the gloves have a little pom pon on them that you could probably buy somewhere or you could make it out of yarn.
Now that you've done the front paws, it's time to do the back. You will probably need some ballet or jazz shoes. You may want something with a slightly more flexible sole. If your shoes are something that you absolutely cannot ruin, you may want to put some socks on over them. They will provide just a little, a very little, bit of protection. If you need more protection against moisture or dirt, you could wrap your shoes in plastic before putting on your socks.
Once you're done, you will be a couple steps closer to being a Jellicle.