Shirt of Simplicity

Adds +1 to max HP for each of the wearer’s unequipped Charm slots. The maximum HP bonus this shirt can grant is +3, even if the wearer is capable of equipping more than three Charms. This shirt grans no HP bonus if all of your available Charm slots are equipped.

If another item is used which grants additional Charm slots (e.g., Charm Necklace), as long as at least one Charm slot is unused, this item will function. E.g., if the player had six Charm slots available but used only five of them, the Shirt of Simplicity would grant +1 to max HP.