This pattern has not only been used as a Batman Halloween Costume but the cap was revised to be a sheep costume of  with long curved horns made from wooly like sheep material.  It was a hit although he was embarrassed.  The pattern has been used for many other costumes.  It is a size4 and 6, I hope you enjoy making or using parts of this pattern for your little ones.  Mine turns 50 soon and he remembers how cool he looked.  Thanks