There is a piece of face armor you can find or, if you play the 'From the Ashes' DLC you can choose stables or guard house. There is no other armor in the game. There are mods to get some, I think.

Near Ledeshko, slightly south of the cave where you find Reeky ( a cave north of the village) there are some cliffs. Stand in the forest above these cliffs. When you look at your map you will see two tall pine trees below the cliffs If you look down from these cliffs you will see a large nest with a dead horse in it. It is very difficult to get to. You will need to head slightly west and try to climb down the cliffs without dying. climb down a few steps then head east to find the nest.

To do this you should save before you start looking down the cliffs. You could very easily fall or get trapped in hedges. If you reach the nest save again. Getting down is very hard to do. I'm posting a link to the area and there is an arrow pointing to the place where you can begin looking for the nest. I warn you, this is a b*tch.

https://kingdomcomemap.github.io/#3/1436.62/2132.16

If you have the 'From the Ashes' DLC, The stables will let you get head armor for your horse. You can also trade horses for Shadowmere, Shadowfax, or Agro. Building the guard house will let you buy the Sinew bow with a power of 82. You can have one or the other but not both.

They made dlcs but didnt make horse armors. That’s sad . Thnx anyways

I found a way UP the hill that you can stay on the horse.

It's on the Rattay side of the nest.

There is none. Best you can do is buy a caparison at one of the stables.

Wtf seriously? Is the game unfinished?