Some might be shocked. In the wizarding world which is quite traditional, Harry in a dress would be a very unexpected sight. His friends like Ron might be initially speechless or even laugh out of pure surprise.
There's also a possibility that it's a new character created specifically for this fanfiction. This new character could bring a fresh perspective and allow the author to explore different aspects of Harry's gentlemanly behavior at the Yule Ball.
Hermione's dress could be a beautiful deep blue, made of silk that shimmers in the light of the Yule Ball. It might have some delicate lace trimming around the neckline and sleeves, giving it an elegant touch.
Their relationship could develop through shared experiences at the Yule Ball. For example, they might have a really deep conversation while dancing that makes them see each other in a new light.
One great 'Snape Yule Ball' fanfiction is 'A Surprising Encounter at the Yule Ball'. It shows Snape having an unexpected interaction during the ball that changes his view of the event.
In this fanfiction about the Yule Ball, there are many possibilities for Harry and Cho. They could be initially hesitant around each other. However, the Yule Ball is a special event full of magic and wonder. Maybe they find a quiet corner to talk, away from the noise and the crowd. During their conversation, Cho might open up about her feelings for Cedric, which could lead to Harry comforting her in a new and deeper way, strengthening their bond.
I think it would be really romantic if during the Yule Ball, when the music slows down, Harry takes Hermione's hand and leads her to a more secluded corner of the hall. There, under the twinkling lights and away from the crowd, he tells her how much she means to him. Not just as a friend, but as someone he has deeper feelings for. Hermione blushes and they share a tender moment that makes the Yule Ball truly special for them.
It could strengthen their relationship. Ginny, being a strong - willed and open - minded girl, might see Harry's act as a sign of his fearless nature and be even more attracted to him.
Yes, there are likely many such fanfictions. The Yule Ball is a significant event in the Harry Potter universe, and Harry's character development and his behavior as a gentleman during it can be an interesting topic for fanfiction writers to explore.