The sword was purchased at the dollar store for (you guessed it!) $1. and we wrapped some red and black ribbons around the handle and attached them with hot glue, ( a busy moms best friend!). You can create a basic black robe without any sewing, instructions here.
If you're really in a hurry, you can simply use black pants, black shirt, black shoes and a black sash to wear as a belt. If your child only has white shoes, consider slipping on a pair of black socks OVER the white shoes (once they are on your childs' feet!).