This activator is linked to defined item, while player wears it (place it in any armor slot).
Command to create:
/react add ITEM_WEAR <ActivatorId>
|%item%||Text representation of item that was in player hands, that could be use to "create" another items using actions ITEM_GIVE, ITEM_DROP, etc.|
|%item-str%||Description of item, that will composed from item's name, data and amount.|