Which Sailor Mars costume should I get?

I would go with the top rated seller that has it for the cheapest price. I think they all just used the picture for it that the original seller or the maker used when they were selling it. I wouldn't be surprised if they were all the same. I don't remember, but I think with ebay you can return as well if it's not what they said it was. just read and see which one will let you return or contact the seller and ask.