The rare and valuable Invisibility Cloak, which makes the wearer invisible, represents the necessity of breaking the rules in order to do what is right. The Cloak belonged to Harry’s father, James, but then came into Dumbledore’s possession after James died, and Dumbledore is the one who anonymously gifts it to Harry. By giving Harry the cloak, Dumbledore is essentially encouraging—or at least allowing—Harry to break the rules when he feels that it is necessary. Harry dons the cloak for the first time when tries to go to the Restricted Section of the library late at night to find out information about Nicolas Flamel, believing that information about Flamel is the key to figuring out—and protecting—whatever is under the trapdoor in the forbidden corridor. Harry and Hermione also use the cloak when they drop off Norbert with Charlie’s friends so that Hagrid won’t get in trouble for keeping an illegal dragon. And, in the ultimate instance of breaking the rules for the sake of doing what’s right, Harry, Ron, and Hermione don the cloak on the night that they try to prevent the Sorcerer’s Stone from being stolen.
The timeline below shows where the symbol The Invisibility Cloak appears in Harry Potter and the Sorcerer’s Stone. The colored dots and icons indicate which themes are associated with that appearance.
Chapter 12: The Mirror of Erised
...last present, which contains a “shining, silvery cloth.” Ron is in awe: it’s an Invisibility Cloak, which he says is extremely rare. Harry throws on the Cloak, and his body disappears... (full context)
Chapter 14: Norbert the Norwegian Ridgeback
...to Norbert and Harry and Hermione carry him up to the castle under the Invisibility Cloak. In the hall, they see Professor McGonagall giving Malfoy detention and taking twenty points from... (full context)
Chapter 15: The Forbidden Forest
Chapter 16: Through the Trapdoor
...Harry is right, and decide to go with him. That night, they take the Invisibility Cloak and the flute that Hagrid gave Harry for Christmas—but there’s one hitch. Neville is waiting... (full context)
Chapter 17: The Man with Two Faces