Some traditions say that Halloween is the night where the vale between worlds is the thinnest so that the dead and demonic can walk amongst the living! So people would dress up to either blend in with the dead and not be cursed, or to wear something even more terrible to scare off the ghosts! [[so very very cheerful at this as he rummages through the rack. Skeleton, another ghost... ooo, a ghoul with a half melted face!]]