For the Xbox 360, you can buy the 200 point Horse Armour Add-on.
Shadowmere can be equipped with armour, if you have the Horse Armour Pack plugin.
You have to download a mod, there is no halo armor in the game itself.
Some of them they did but things like horse armor and extended fighters guild, etc. they did get Shivering Isle and The Knights of Nine
You can, if you use a mod.
daedric
It is either leather/steel or quest\enchanted armor or blades armor
No, no Bone Armor exists in game, without the assistance of a mod (modification).
Barding is armor designed for a horse.
Unfortunately, it's impossible.
its ebony and u have to find it
you need to download it as a mod for the PC.