So, it is with no great surprise that the number one viewed item in my shop this past week is the Fish Costume, which we'll not discuss. And, number two is ....
Butterick 4940 - this one goes all the way to the ankle.
Butterick 5657 - Not quite as Harem-y as the others but could still do in a pinch.
With some diligence, you should be able to find some results out in Google Land. I tried Google Shopping, but most of the results were not very Harem.
I do hope you find what you are looking for ... be it Halloween or otherwise.
Thanks for dropping by,