Have you thought about selling internationally?   As gorgeous as the costumes are they are definitely more weather appropriate for other countries at present.

There was recently a US seller asking about postage etc to send her items to Australia....she was selling dress up costumes for little girls...very pretty but she was asking hundreds of $$$$ for them.  To me the prices were so outrageous that I would not even consider buying them but I can't help thinking if US buyers are prepared to pay prices like that then they would jump at the sort of prices you are asking.