For hat: Use melted candy in cut bag to pipe 2 3/4 in. circle on waxed paper; chill in refrigerator.
Coat cone-shaped corn snack with melted candy; let set on drinking straw inserted in craft block; repeat process for second coating of candy.
After candy pieces are chilled, attach top of hat to bottom.
Pipe tip 5 zigzag band around hat with buttercream icing.
Pipe tip buckle on hat. Attach hat to cake with icing.