You might need some costume accessories to wear with your costume or to put on like makeup. The Goth costume is dark, and your make up should be too. Use black nail polish, heavy dark eye liner, black lipstick and very pale face powder. Some people like to use a little gray or black for blush. You can find this make up, punky and funky goth wigs and even some jewelry to dress up your costume. It's fun to dress up and be outrageous for Halloween!
You might want to look at these . Some people consider Renaissance costumes gothic. Even if you don't, there are some nice costume choices there.
Gothic Halloween Costume Pictures
There are other costumes for the rest of the family you can take a look at including: