Unique item set bonus

[Logar]

What are the unique item types?:

Armour
Weapon
Shield
Accessory
Ring?
Others?

I don't know if there is already a bonus, if not, how about a bonus for a character who wears a full set of unique item types?

Ideas on a postcard....

[Vita`]

Weapon, Armour, Shield, Ring, Book, Accessory.