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With new Transmog system you no longer can show/hide your helmet in interface options, API functions are also gone. This my workaround this problem for people like me, who like to hide their helmets while in resting zones. Now addon, instead of hiding helmet, simply unequips it and puts it in the 4th bag and then equips it when you leave resting zone. So to if you want to be helmetless in cities you have to have at least one slot free in your 4th bag otherwise helmet will still be on your head.