Not sure of what will happen this time, but in the previous Halloween contest only 4 outfits of the top ten were realized as DLC. The rest of them, even getting the majority of the votes, was discarded from TN for being part of the game.
The fansevice ones "won" but the actual costumes we got were more than just that. http://youtu.be/2D0XPnDkKbY
The rest of them, even getting the majority of the votes, was discarded from TN for being part of the game.