Of course,I understand that. My point was that if she didn't mind wearing much shorter skirt to school then maybe it wasn't a problem to her to put on a longer dress. If the girls were uncomfortable though, which is something we can't really know, then it is indeed a problem
As others said, I find it a bid odd due to that whole heels situation. They give off the girls more mature look and knowing they're teens it just seems weird to me. Especially when the concept is tennis court
My point is regardless if idols are okay with their outfits or concepts, you have to think what's the intention of companies with all this stuff. I'd not say anything if idols are adults and they are the ones choosing the outfits and the company has nothing to do with it but that's not the usual.