Okay, I've got the David Copperfield (and more amateurish youtube versions) figured out. As has been said, the idea is actually simple but constructing it without the exact pattern might be a bit difficult. Except my mother is, among other things, a professional seamstress. I might be able to convince her...
The other version, though (Andrew Mayne?), is still more impressive, I think, though I think a serious presentation would work better. I might have to work on a Bizarre bit for the upcoming Halloween spookiness.