Pirate - basically just ragged clothes & a bandana. Eyepatch if you want. Hoop earring. Makeup.
Mummy -- around 4 packs of cheesecloth & safety pins
Devil - red clothes, horns from red pipe cleaners or red felt & hairclips, the pitchfork you can make from twisted pipe cleaners stuck to a stick and wrap in duct tape. Tail you can make by wrapping something red (electrical tape, yarn, ribbon) around rope. Or you can make the tail from pipe cleaners too. Or you can stuff a long red sock.