I chose to go a different route. This is Gryffindor's festival, after all, perhaps the dancers should reflect more of that. So I went for a warrior/ranger inspired look since the first thing I think of when I think of bravery is warriors. Obviously, true metal armor would be a bit heavy, so instead the jacket reflects those lines, especially with how it buttons up like an officer's coat. There's a little shoulder capelet, again tying into a warrior (duelist in this case), but also adding a bit of flounce for when they do their spins and skips. I raised the skirts to be knee-high so there's less of a tripping hazard with them but kept it full for again flounce reasons. Flounces are very important. I also added leather boots that are flat for comfort and ease of movement. Finally, I added in bracers on the wrist, again tying into the warrior vibe as well as adding shine. There's also a circlet for them to wear, which is really there for shine. I also suggest a braid to wear their hair in, as I used to find them comfortable and convenient and they have a bit more flair than just a ponytail. Plus, even modern-day warrior women tend to wear their hair closer to their head.