Item from harry-potter-philosophers-stone by
A shimmering silvery cloak left anonymously for Harry at Christmas with a note saying it belonged to his father — it renders the wearer completely invisible and is unlike any other invisibility cloak in existence.
The Invisibility Cloak arrives at Christmas, Harry's first real Christmas, wrapped in anonymous paper with no card — just the note about his father. Harry does not know who sent it. Dumbledore, who had borrowed it from James Potter before his death, decided it was time to return it. Harry uses it immediately and often. He sneaks into the Restricted Section of the library, looking for information about Nicolas Flamel. He stumbles into the room with the Mirror of Erised and spends night after night watching his parents smile at him from the glass — the first time he has ever seen their faces. He uses it to sneak past Filch and Snape. He takes it to the trapdoor. The cloak is the first physical connection Harry has to his father, and he treats it accordingly — with reverence, with excitement, and with absolutely no intention of using it responsibly.
A large, flowing cloak of silvery, shimmering fabric that feels like water woven into material. When draped over someone, it renders them completely invisible — not just camouflaged but truly gone. It folds small enough to fit inside a pocket. The note that came with it read: 'Your father left this in my possession before he died. It is time it was returned to you. Use it well.'
Also known as: the Invisibility Cloak, Invisibility Cloak, the Cloak, Harry's cloak