Alistair's Cloak of Many Images

This fancy long cloak is infused with powerful Illusion magic.

While worn and attuned, the user can cast Mirror Image once, recharging at the next dawn.

Additionally, while wearing this cloak, you can use a bonus action to change the style, color, and apparent quality of the garment. The cloak's weight doesn't change. Regardless of its appearance, the cloak can't be anything but a cloak.