I'm looking to do this too since my girl is perfecting her Cheshire. It shouldn't be too hard you could easily buy a black and white trucker hat and draw the design on. For the top I'm thinking of making it out of foam, more like armor. Red shirts and a dye a pair of red pants and your good. The gauntlets shouldn't be too difficult either. I might just go with a batman foam pep, elongate it and get rid of the fins and add some red mechanic gloves.