Gone are the days when you could throw a sheet over your head and call it a Halloween costume. Halloween is serious business. Retailers expect Americans to spend about $8 billion on the day, according to a National Retail Federation survey conducted by BIGinsight. Of course, part of the fun of the holiday is coming up with a creative Halloween costume. About $1.1 billion will be spent on children’s costumes this year. For kids, there will be plenty of the traditional costumes: princesses, super heroes, witches and pirates. But even these popular themes are subject to interpretation. We’ve taken a look at what the trendiest costumes are for kids this year. Click ahead to find out what they are, some may surprise you. Fuzzy Owl Costume Forget the ill-fitting vinyl costumes. These days, the selection of adorable baby and toddler costumes see...