Well, not so much kingdom helmets for say, CP. CP Has quite a bit kingdom item-wise. Forest could use some items. Maybe like a Crown for Forest that is like a wreath intertwined with leaves, flowers, and whatnot.
A Royal Helmet for Dustari would be pretty cool. And for Samurai maybe some armour that covers the entire body (body and legs) that is like a dress-type of costume. However Samurais wear their clothes.