Thread:AkiBuster/@comment-25832917-20150905223528/@comment-5018769-20150905233824

Well, there's no official English spelling right now, but the ghosts are called Parka Ghosts (パーカーゴースト) for sure as confirmed by TaintedSeraph on his Ghost blog. Parka is a type of coat with a hood, which is the only thing it could refer to.