Perhaps in the fanfiction, there's a magical event where everyone has to swap genders for a day as part of a spell gone wrong. Harry then has to deal with wearing a dress and all the new experiences that come with it, like different ways of moving, sitting, and even the reactions of his friends like Hermione who might find it hilarious or Ron who might be a bit shocked at first.
Maybe it's for a school play at Hogwarts. Harry is chosen to play a female character and has to wear a dress. His friends Ron and Hermione have different reactions. Ron might tease him at first but then support him when he sees how serious Harry is about doing well in the play. Hermione, on the other hand, helps him with his lines and how to act in the dress.
One possibility is that in an alternate universe, the wizarding world has different gender norms and Harry is used to wearing a dress as part of his daily attire. This could explore how his character develops differently, how his relationships with others change, and how the overall story of Hogwarts and the fight against Voldemort might be altered in this new context. He might face different challenges and gain unique perspectives due to this cultural difference.
In fanfiction, it might be a way to add humor. The image of the heroic Harry Potter in a dress is quite comical. Writers might use this to create light - hearted moments in the story. It could also be used to create a contrast with his usual heroic and masculine image, making the story more interesting and engaging.
One idea could be that Harry discovers a magical dress in the Room of Requirement that gives him special powers. Another could be that he wears a dress as part of a disguise to infiltrate a wizarding event. Or perhaps he is cursed to only be able to wear dresses for a period of time and has to deal with the reactions of his friends and foes alike.
One possible plot could be that Naruto is forced to wear a dress as part of a mission. Maybe he has to infiltrate an all - female event or place where men are not allowed, so dressing as a woman in a dress is his only option. He initially feels very awkward but then realizes he can use this disguise to his advantage and gather important information.
One plot idea could be that Harry wears the trench coat as a disguise while he secretly investigates a new dark wizard threat in the wizarding world. He uses the trench coat to blend in with Muggles as he follows leads that cross into the Muggle realm.
One possible plot idea could be that Harry discovers an enchanted flute in Hogwarts. As he plays it, it has the power to soothe magical creatures. For example, it could calm the Hippogriffs in the Forbidden Forest, creating a unique bond between him and the creatures. Another idea is that the flute playing is part of a secret magic that Harry has to master to defeat a new dark force. Maybe the flute was left by one of the founders of Hogwarts, and its music holds the key to unlocking a powerful spell.
Maybe a spell goes wrong and causes a character to develop diabetes. The story could then be about how they adapt to this new situation. They might search for a magical cure within the wizarding world, or learn to live with it with the help of their friends, like Hermione using her research skills to find suitable magical remedies or ways to manage it.
Maybe Harry discovers a hidden part of Hogwarts where a Wendigo has been lurking. He has to use his magic skills to either defeat it or find a way to coexist with it.
Perhaps in a 'harry potter yells fanfiction', Harry yells when he discovers that someone has been spreading false rumors about his friends. He could be in the Great Hall, stand up, and yell at the perpetrator, creating a big scene full of drama and conflict within Hogwarts.