All items equipped here will directly affect the statistics of your character and will provide extra defense and extra damage.
One can also equip weapons here, which can be used throughout their adventure.
Vanity is the armor which will be visible to you and others and still give you the advantage of Armour pieces equipped in armor section.
One can toggle which armor parts are to be used as vanity by clicking on the "Eye" icons next to the armor parts.
Clicking this ask you to confirm if you wish to erase your inventory and whatever armor/weapons you have equipped. Clicking on this is not recommended.