|This article is non-canon.
This article covers a subject that has been deemed non-canon by either the author or the Harry Potter licensees, and thus should not be taken as a part of the "real" Harry Potter universe.
- "Proper dress and decorum is to be mantained at all times."
- —The Decree[src]
The Educational Decree Number Forty-Five was one of the Educational Decrees created by Dolores Umbridge, then-Hogwarts High Inquisitor. This Educational Decree made the wearing of school uniforms at all times Properly mandatory. 
Behind the scenes
- As the numbering for this Educational Decree is not consistent with the numbering established in Harry Potter and the Order of the Phoenix, it cannot be considered canonical.
- Harry Potter and the Order of the Phoenix (film) (First appearance)