What armor is this?

Does anyone know what armor this is? It appeared in my inventory suddenly and I don't remember picking it up anywhere. I did the quest with Sheogorath to get Wabbajack and after the next sleep she appeared.

Does anyone know what armor this is? It appeared in my inventory suddenly and I don't remember picking it up anywhere. I did the quest with Sheogorath to get Wabbajack and after the next sleep she appeared.