I found this on the internet. Haven't tried it though. Does this help?
http://www.diynetwork.com/how-to/make-and-decorate/entertaining/halloween-decoration-how-to-make-human-size-ghosts
http://www.diynetwork.com/how-to/make-and-decorate/entertaining/halloween-decoration-how-to-make-human-size-ghosts