From: Black Swan
Urgency: You have 4 days until Halloween
What you'll need:
This one's for the ladies. (Or guys; do whatever you want, it's Halloween.) A bodysuit, a petticoat, and some dark pantyhose are all you need, all graciously compiled into one place by the moral saints at American Apparel (link). For feathers, hit up costume shops for bags of ostrich feathers (link), typically five in a pack.