At the time, I was disappointed we didn't get a dress or some option of clothing for the ball. But, really, as others pointed out, the military uniform made sense. Sometimes I feel like the only person who doesn't hate it. Yeah, the colors could have been better (and since the Inquisition's color is orange, maybe it could have been a neutral color or black or white with an orange sash?), but it was practical.
You're not the only one. I like the blue sash and the uniform looks red to me instead of orange. Red and blue go together. But I would have liked to have worn a dress like Morrigan's or one that showed her Dalish heritage.
My first playthrough, I brought Cassandra, Solas, and Varric. I brought Cassandra along specifically because I knew this would annoy her and so that both her and my Quizz could be annoyed together. I usually bring Varric along to places, because someone needs to record this and what better way to do so then having seen it unfold in front of you're very eyes. But now, I usually bring Varric, Iron Bull, and Solas along, just to rub our diversity and equality in those prats' faces. Plus, Iron Bull is a spy who is good reading people and might have been useful in figuring out who among the nobles was an assassin, sadly it didn't play out that way.