I completely updated this! I am really embarrassed at my first tutorial, so now..there is this one :] Just in time for halloween!
FYI: You will need an entire roll of plastercloth, and if you don't use an entire roll, you really should lol. Just to make it sturdy. Its a solid mask, but isn't indestructible.
You can attach it to your face by hotglueing ribbon or elastic, but the heavier the mask, the more youll need to make sure it sticks to your face. (I once used long strips of velcro. That worked)