Darth Vader Suits
It's no accident that we tend to call our nippers little terrors, and what better costume could there be than that of the most evil Sith Lord the galaxy has ever seen. It's unlikely that any progeny Darth Vader might have produced would have looked quite as cute as this, but never underestimate the power of the dark side, a small child can play mind games like a true master - and you'll need all the powers that the force possesses to get them out of this suit once they've got it on.