We have the bra by Capezio;it's good,not great,but good. I prefer her to wear something more supportive with an athletic performance,but many outfits/uniforms,just don't allow that anymore.
And yes,they are like leotards and my cp has worn and owns,more leos,than we know what to do with,but the difference between Leo's and briefs,is any good teacher,requires tights with leotards,these are require to wear without tights. I just don't think it's the best idea to put girls in brief style shorts,with nothing underneath.
ETA: dancers aren't allowed to wear underwear with any style bottoms,so that there won't be any underwear lines or underwear showing. When they were tights with leos,they're protected/covered. They aren't going to be protected in this style. Luckily for us,the designers made one that looks exactly like this one,but with shorts instead of briefs,that the studio owner approved,so I'll be selling this one and getting the shorts version of this outfit. She'll be much more covered and I don't have to worry about the world getting a free peep show from my young child! :)