Sweeney Todd The Demon Barber Of Fleet Street Costumes Would be So Creative and So Cool. There Could Be A Mrs. Nellie Lovette Costume Complete with a dark Blackish Grey Dress. Also Mrs. Lovette Could Wear An Apron and Carry around A Rolling Pin or even Better, a Fake Butchers Knife. Of Course You Need a Sweeney Todd, For Sweeney Todd you could wear a white dress shirt with puffy sleeves (Sort of Like Pirate shirt Sleeves), Also Sweeney could wear Old english Looking Black Pants.You Could also Spray your hair Black using Costume Hair Dye in those Spay cans. Then You would want to Go Back a Spray a Streak of White Hair Dye. It Would be even better if you Carry around a Fake Barbers Knife.