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One Potterhead shared the heart-warming piece of trivia with fellow fans on the Harry Potter sub-reddit and now we all love Daniel Radcliffe even more than we did already!
The subtle easter egg explains why Harry is often seen wearing a cardigan in the film, rather than his usual Hogwarts jumper or cloak.
Sharing the hidden detail, the fan wrote: "In Harry Potter and the Order of the Phoenix (2007), Harry wears button down sweaters at DA meetings similar to what Professor Lupin would wear. This was Daniel Radcliffe's idea as he thought Harry would want to emulate his favourite DADA teacher"
The first DA refers to Dumbledore's Army - a secret army initiated by Harry, Ron and Hermione to help other Hogwarts students learn real Defence Against the Dark Arts (DADA).
The trio decided to set up the organisation when their new professor, Dolores Umbridge, refused to teach anything in her classes other than textbook theory.
Professor Remus Lupin had been the students' earlier Defence Against the Dark Arts professor in Harry Potter and the Prisoner of Azkaban and when he wasn't in a tweed jacket, he could often be seen wearing a cardigan.
Discussing the theory, fans confirmed that it all added up.
"That’s really awesome. I’m gonna go binge the movies now" commented one Potterhead.
"This is the most unexpectedly heartwarming thing I've seen in a very long time" wrote a second.
"He absolutely would, he loved Remus" confirmed a third.
Others commended Daniel Radcliffe for supposedly making the decision for his character.
"The fact that it worked, and it was good idea, is the mark of a great actor" read one comment.
"This is why DanRad is and always will be the perfect Harry" raved another.
And that's not all, either.
Fans have also noticed a powerful tribute that Harry makes to his late father James Potter through his clothing in the final film Harry Potter and the Deathly Hallows: Part II.
A side-by-side picture created by fans sees Harry in the Battle of Hogwarts beside old photo of James Potter. The pair are wearing an almost identical outfit consisting of an unzipped jacket and an undershirt.
Similarly, Neville Longbottom and his father, Frank Longbottom, are seen wearing knitted garments with a similar pattern.
Neville also fought during the Battle of Hogwarts after refusing to join Voldemort’s crusade of Death Eaters.
You can read more about that easter egg here.