Well, in my mind they are ghosts. Somebody posted this picture a while back, I can't remember who or where this picture was taken. It looks like it must have been at an amusement park from the roller coaster track in the background. I always thought this would make a good costume, so this year I bought some cheap drop cloths from Lowe's, and dyed them a slightly darker color to replicate the look of these props. I just used some black material under them, hoping it would appear we were kind of "floating" in low light. I also used some black, see through material inside the hood for that faceless look. Here's the picture I got the idea from...