Your outfit request is not that unusual. Hopefully you can find somebody that can fulfill your request.

good luck

Any preferences as to the costume?

Is there a specific anime character that you have been fantasizing about, or is it a Wonder woman / Cat woman fantasy your looking for? Maybe your on the darker side and looking for someone to dress up like Harley Quinn?

You might want to let the ladies know what your really looking for instead of being so vague.

....there will be plenty of sexy ladies in sexy costumes