Another reaction could be confusion. Draco might not know how to feel. On one hand, he has his Slytherin pride and his clothes are part of that. But on the other hand, seeing Hermione in his clothes gives him a strange feeling in his stomach. He might end up being more curious about Hermione and her reasons for wearing his clothes.
A great idea could be a time - travel fanfiction. Hermione accidentally travels back in time to Draco's childhood. She has to blend in, so she borrows some of his clothes. Draco, as a child, is curious about this strange girl in his clothes. This interaction could change the course of their future relationship in the original timeline.
In a fanfiction with this theme, it could be set post - war. Draco and Hermione find themselves in a situation where they are on the run from some dark wizards who are after them for different reasons. During their escape, Hermione gets wet and cold. Draco, having a change of heart after the war, gives her his warm cloak. This act of kindness begins to break down the barriers between them, and they start to have deeper conversations, realizing they have more in common than they thought.
In some fanfictions, it could be a prank gone wrong or right. Maybe Draco lost a bet and has to wear Harry's clothes as a consequence. Or it could be a mischievous plot by his friends to see his reaction when he's in Harry's attire. It might also be a way for the author to show the contrast between their personalities. Harry's clothes on Draco could highlight how different they are in nature while also showing that they might not be as far apart as they seem.
In the fanfiction, Harry wearing Draco's clothes can be a significant step in his character arc. It could represent his journey towards unity and breaking down the barriers between Gryffindor and Slytherin. As he puts on Draco's clothes, he's not just changing his appearance but also challenging the pre - conceived notions he had about Draco and the Slytherin house as a whole. This act could lead to him becoming more inclusive and open - minded, which are important aspects of his character development.
Maybe it could be a story where Hermione is cold and Fred offers his clothes. Then it becomes a cute moment that leads to a deeper friendship or some unspoken feelings between them.
One possible scenario could be for a disguise. Maybe Harry needs to blend in among Draco's group for some sort of undercover mission at Hogwarts. Another could be as a result of a magical mishap, like a spell gone wrong in a transfiguration class that swaps their clothes. Or perhaps it's part of a bet or dare within the fanfiction's plot.
One interesting scenario could be that Hermione wears Harry's clothes during a secret mission. It might add an element of disguise and also show a new level of closeness between them. Maybe she has to quickly put on his clothes to blend in with a group that is expecting Harry.
It could be a symbol of a new relationship dynamic. Maybe it represents a shift from their traditional rivalry to a more complex connection. In fanfiction, it might be used to show a budding romantic relationship or a sign of a newfound understanding between Hermione and Draco.
Draco may become more empathetic. Harry's clothes could serve as a reminder of Harry's experiences and struggles. This could make Draco more understanding towards Harry and others in similar situations. For example, if Harry has faced a lot of prejudice in his life and Draco is now wearing his clothes, Draco might start to think about how he has contributed to that prejudice and want to change.