The spookiest day of year, Halloween, is only a month away, which means costume shopping is in full swing. While traditional costumes are still a popular choice, Hollywood-inspired characters are expected to make an appearance at parties everywhere, according to the 2010 Top Costumes survey, released this week by the National Retail Federation. Buzz Lightyear, Harry Potter and Alice in Wonderland made the list, while the unbranded witch, vampire, pirate, nurse and wench, respectively, are the top five picks for adults. That's not surprising, since classic costumes are always easier and cheaper to obtain. In fact, the NRF said that while more people than ever plan to dress up for Halloween, they'll be looking for ways to save money in doing so. The leading costumes for kids are generic princess, Spider-Man, witch, pirate and Disney princess. "Aiming to attract shoppers of all ages, retailers have already begun stocking their shelves with a wide variety of costumes," per the NRF. And let's not forget our furry friends. You'll see plenty of pets dressed as pumpkins, devils, witches and hot dogs. I've already seen several retailers capitalizing on that four-legged demo.