Armors
It’s purely a cosmetic item. Many of the items are unique (such as Elementalist headgear), some are not normally available to that armor class (such as Engineer googles), and a few are obtainable normally (such as Warrior shoulder pads).
It does not change the personal story in any way, it’s just for looks (and technically a minuscule bit of armor or an upgrade slot, but those are so minor).