The only bind on equip armour drops from the new instances that present a new cosmetic appearance are two sets of light armour. All medium and heavy armour pieces I have come across, share appearance with Isengard quest rewards. I have shared one of the sets in a previous post. The set in this post is another light armour set, but I seem to be unable to complete it. I have not found any shoulders or boots that would be part of this set, so I am beginning to wonder if there are any? I only have the chest, legs and gloves. The boots in this picture, belong to the other light armour set. Perhaps there are only three pieces to this set, but I would appreciate any info on that if you have some!
If you want to know where a certain armour piece or cosmetic comes from, you can look it up in the Lorebook, by typing its name into the search box. You can equip any piece of armour cosmetically through the wardrobe, even armour that is not meant for your class or level.
Chest : Arth-crus, white dye (boe drop from Isengard instances, light armour)
Head: Shabby cap, white dye (Yule Festival quest reward -helping the poor-)
Hands: Durn-durnvol, white dye (boe drop from Isengard instances, light armour)
Legs: Rhuvel-socas, white dye (boe drop from Isengard instances, light armour)
Feet: Rhydhid-lhopan, white dye (boe drop from Isengard instances, light armour)