The first book and film both contain the information, from a note pinned to the cloak on Christmas Morning. I cannot remember if the book quote is the same word for word but in the film Harry receives the cloak with the following note:

Your father left this cloak in my possession before he died. It is time it was returned to you. Use it well.

The note was from Dumbledore.

ETA: I have just checked -- Dumbeldore's note is identical in the book and the film.

The first book and film both contain the information, from a note pinned to the cloak on Christmas Morning. I cannot remember if the book quote is the same word for word but in the film Harry receives the cloak with the following note:

Your father left this cloak in my possession before he died. It is time it was returned to you. Use it well.

The note was from Dumbledore.

ETA: I have just checked -- Dumbeldore's note is identical in the book and the film.

For completion: Dumbledore reiterates the note at the end of Philosopher's Stone:

Harry:

And the invisibility cloak - do you know who sent it to me?

Dumbledore replies:

Ah - your father happened to leave it in my possession, and I thought you might like it.

The first book and film both contain the information, from a note pinned to the cloak on Christmas Morning. I cannot remember if the book quote is the same word for word but in the film Harry receives the cloak with the following note:

Your father left this cloak in my possession before he died. It is time it was returned to you. Use it well.

The note was from Dumbledore.

ETA: I have just checked -- Dumbeldore's note is identical in the book and the film.

The first book and film both contain the information, from a note pinned to the cloak on Christmas Morning. I cannot remember if the book quote is the same word for word but in the film Harry receives the cloak with the following note:

Your father left this cloak in my possession before he died. It is time it was returned to you. Use it well.

The note was from Dumbledore.

ETA: I have just checked -- Dumbeldore's note is identical in the book and the film.