Right now, all I can imagine is new parent James Potter, half-asleep and completely out-of-it, grabbing the first blanket-like thing in reach to wrap baby Harry in, before putting him down and going back to bed.
In the morning, Lily shoves him awake and snaps, “I can’t find the baby or your dumb Invisibility cloak.”
And James just stares at her, then realizes, “I have made a terrible mistake.”