Well, perhaps Ginny is trying to make Harry jealous by wearing his clothes in a fanfiction. She might put on his old Gryffindor scarf and walk around the common room, catching Harry's eye. Or, in a more adventurous scenario, Ginny has to disguise herself as Harry for some reason and has to wear his entire set of clothes, which leads to all sorts of comical and dangerous situations as she tries to act like him.
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 possible scenario could be that it's for a school play. Maybe Hogwarts is putting on a production where they need boys to cross - dress, and Harry is roped into wearing girl clothes for the role. It could add a comical element to the story as his friends react to his new look.
Maybe in the fanfiction, Bella wears Edward's clothes as a statement. It could be a way for her to show that she belongs to him in a sense, or that she's part of his world. She might put on his shirt before going to meet his family, for example, as a sign of respect and acceptance of their relationship and his vampire lifestyle.
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.
Perhaps in the fanfiction, McGee wears Tony's clothes as a joke among the team. The others initially laugh but then notice how different McGee looks and acts while wearing them. It could lead to some humorous banter and self - discovery for McGee.
Perhaps in a situation where they are in a hurry and Sakura has no other option but to put on Sasuke's clothes. This could lead to some interesting interactions when Sasuke sees her in his attire, like a moment of surprise and then a newfound closeness as they share a laugh about it.
One possible scenario could be that Ginny meets an old acquaintance who has changed a great deal and she starts to have feelings for this person while still being with Harry. Maybe they share a common interest that she feels Harry doesn't understand. However, this goes against Ginny's strong character in the original series, so it's a very different take in fanfiction.
In some versions, it could be that Harry has to die to break a dark curse placed on Ginny. He discovers that his life is the key to saving her and willingly gives it up. He might have a premonition about Ginny's fate and decides that his death is the only way to change it. He then confronts the source of the curse and allows it to take his life instead of Ginny's.
One interesting scenario could be that Stiles wears Derek's clothes to feel closer to him. Maybe Derek has gone away for a while, and Stiles misses him. Wearing his clothes gives Stiles a sense of comfort and connection.
Maybe they go to a wizarding cottage in the countryside. They explore the nearby magical forests together, discover new magical creatures, and Ginny could teach Harry some new Quidditch tricks in the large open fields around the cottage. And of course, they have cozy evenings inside, cooking together and snuggling up by the fireplace.