Maybe it's a dare. His friends could have dared him to wear Tony's clothes for a day and he reluctantly agrees. And as he wears them, he realizes there's more to Tony's style than he thought.
There could have been a mix - up. For example, their clothes got mixed up in the laundry. McGee accidentally puts on Tony's clothes and then decides to just go with it for the day. And as he goes about his day in Tony's clothes, all sorts of interesting things start to happen around him.
Maybe McGee lost his own clothes somehow. So he has no choice but to borrow Tony's clothes. It could be an accident like his luggage got lost or his clothes got ruined in an incident at work.
The plot might involve McGee wearing Tony's clothes for a special mission. He could be undercover and using Tony's clothes as a disguise. But things go wrong when the other characters start to notice differences in his behavior because he's wearing Tony's clothes and they expect him to act like Tony. It could lead to some comical situations as McGee tries to navigate this new identity.
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.
She might wear his clothes because of necessity. For example, if her own clothes got damaged or lost during an adventure. Harry's clothes would be readily available and a practical solution.
One reason could be that they are in a situation where they need to disguise Hermione as Fred for some sort of mission. So she has to wear his clothes to blend in. Another possibility is that it's a symbol of their closeness. After a particular adventure where Fred saved Hermione, she wears his clothes as a sign of gratitude and a growing bond between them.
It could be for a funny or imaginative twist. Maybe to make the chicken stand out or for a special event in the story.
I'm not sure specifically about a 'tony and mcgee kiss fanfiction'. However, many fanfiction communities are really large and diverse. You could also check out some fan - run forums related to the show or characters where fans might discuss or share such stories. Maybe post a request there asking if anyone knows of such a fanfiction.
One common theme is friendship. Writers often explore how their relationship grows and develops. Another theme is teamwork, as they are colleagues and often work together on cases.
Maybe it's a sign of closeness between them. In many relationships, sharing or wearing each other's clothes can show a deep bond. Annabeth might be cold and Percy's clothes are just there and convenient.
To show a deeper connection between them. It's a simple yet effective way to visually represent their relationship. When Sakura wears Sasuke's clothes, it can signify that she is part of his world in a more intimate way.