[Asra*]

I don't think I pro-level costume has to be a designer label - the label of a good/trusted designer just means the costume can be assumed to be of good quality.

I define a pro-level costume as being:

well-made - meaning designed to stand up to actual dancing for many years without falling apart (assuming it's reasonably well cared for)

well-fitting - meaning designed to flatter the dancer's shape and support what needs supporting

attractively and tastefully covered and decorated

Of course, lots of beading and stones are a hallmark of good (cabaret) costumes since cheap crappy costumes will use less of these, but simple can be just as elegant and a homemade costume can still be suitable for a pro if it fits the above criteria.