The popularity of the tv series and then the movies has made Batman costumes an enduring choice for Halloween. For a father and son, an obvious choice is Batman and Robin. If your son has to copy his Dad in everything he does, why not try matching Batman adult and Batman child Halloween costumes? Also perfect for a big brother / kid brother dynamic duo. There are many to choose from, including those styled on the recent Dark Knight movie, but I think that these are a little menacing for a young boy. The classic design is your clear winner.
