Halloween: Witches, minions and lawyers, oh my! WASHINGTON, Oct. 11 (UPI) -- The National Retail Federation in Washington said adults, by the width of a black cat's whisker, spend more on their Halloween costumes than is spent on kids. Halloween costumes will bring in $2.6 billion this year, the trade organization said. Reportedly, $1 billion of that will be spent on children's costumes and $1.2 billion will be spent on adult costumes. That leaves a few dollars leftover. MarketWatch reported Friday that the organization expects the remainder, about $330 million, is expected to be spent on costumes for pets. By far the most popular costume for adults is witches. It is expected there will be about 5 million in the coven this Halloween. They will have the company of about 2.9 million dressed as Batman and smaller numbers of zombies and Draculas, MarketWatch said. The most common costume for children is princess, which does not include a separate division of Disney princesses, which are also in the top 10. The top 10 for children also includes animal, Batman, superhero, Spider-Man, witch, zombie, Superman and fairy. Each Halloween includes a few fad-oriented breakout costumes. Google Shopping said popular searches for costumes suggest this year will include Despicable Me minions, flapper girls from the Great Gatsby era and plenty of Miley Cyrus wannabes. A few congressmen -- and a few unconscious football players -- should round out the field.