You're not going to be able to sell it to anyone in Japan.
Cosplay.com would have been great, but Cosplayers.com relies on English and the average Japanese doesn't speak English.
For info, "Cosplay" isn't considered English as it is a made up word that is presented in katakana characters. Most Japanese won't even realise that it is a contraction of "costume" and "play"
You may be able to sell it to an English-speaking market - I see a lot of references on Google - but don't hold your breath than anyone in Japan would want it...