Looking through these Superman Costume pictures will let you see some examples and give you some good ideas so you can decide what costume is best for you to wear on Halloween.
Here's an adult authentic Superman costume.
Here's a Superman, Man of Steel costume.
Here's the costume worn by Christopher Reeves in the Superman III movie.
Here's an infant Superman costume.
Here's a Clark Kent / Superman transitional costume.
Here's a superman costume for small kids.
Here's a short sleeved muscle chest Superman costume.
Here's a Superman costume hoodie.
The perfect couples' costume idea is Superman for the guy and Super Girl for the girl.