wishing cap

from WordNet (r) 3.0 (2006)

wishing cap
    n 1: a magical cap that secures whatever one wishes for

from The Collaborative International Dictionary of English v.0.48

Wishing \Wish"ing\,
   a. & n. from {Wish}, v. t.
   [1913 Webster]

   {Wishing bone}. See {Wishbone}.

   {Wishing cap}, a cap fabled to give one whatever he wishes
      for when wearing it.
      [1913 Webster]