Well, the base of the costume looks like it's just black leather.
(see Lisa's picture at bottom)
Depending on how close you want your costume to match, you might be forking out a pretty penny for this.

From what I can see of the 'pom-pom' looking balls that cover her neck, it looks like they're made from netting material that you can pick up from a local fabric store.

Here's an example of netting material that is used in a dress.
http://in.yimg.com/i/in/fashion-week-2008/slideshows/guari_nainika/7.jpg

I'm not sure exactly how those balls are made, but it looks like different colors of netting were knotted into a ball (all the same length) and cut at the edges.

Of course you can get creative and use other materials if you can't find enough colors of netting locally.

I'm sure you'll make a great clown regardless!

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