Not that buying costumes off a cosplay site is a bad thing, but you might want to try your luck with actual commissioners on cosplay.com. The forums have reviews for all the commissioners, and their prices are probably reasonable for whatever costume you want commissioned.
Also, some advice. Never use Milanoo. Most, if not all of their reviews are negative, save for the reviews they write about themselves. I've also heard Cosplayfu is linked to Milanoo, so you might want to avoid them, too.