Looking through these Cosplay 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 are video game Cosplay costumes including Tomb Raider's Lara Croft.
Here are Alien and Predator Cosplay costumes.
Here's a Halloween vampire Cosplay costume.
Here's a sexy Pirates of the Caribbean Cosplay costume with hat and eye patch.
Here are awesome Cosplay costumes of Batman and Robin.
Here's a Queen of Hearts Cosplay costume for Halloween.