In Irish Dance, once you reach the fourth level, Novice, then you can get a solo dress. These are kind of professional ballet tutus, and cost about the same amount.
These are some of my favorites I’ve seen:
The third one was found on Dance Again a while back, but is not on the website anymore, or at least not that I can find.
The first and second dresses are both from Elevation Designs As far as I know, neither are currently for sale.
Hope you find some new favorite dresses!