The horns on this devil costume are the most spectacular I've seen on any infant costume. This also comes with a soft black cape.
This plush hooded devil costume looks so warm and fuzzy, you'd almost be tempted to dress Baby in it for their wintertime Christening. (Probly better not, though). Check out the little creature tucked into the pocket too! Also available on eBay.
You know what I think would be hilarious? Getting 13 infants all together for a group Coven photo shoot dressed in costumes like this!