Aureol around a Pretender's head would be fine. After all, Persians considered it a sign of sacred power of rightful ruler.
As for their extra armor, it would probably be bits & pieces of mostly metal.
They had finest metalworkers, after all, & I didn't hear the same about their leatherworkers...
To Sombre:
Yeah, Parthians had heavy cavalry, & a pretty effective one at that. But much of riding before this would actually be commited was done by lighter troops who weared little armor. And I didn't said that Arabs should not have medium to heavy cavalry too, just that common nomads/raiders would wear mainly just robes & turbans (the latter word is iirc Turkish, but you get the idea). Elite warriors should probably get something like chain cuirass (scale armor was used more by Parthians/Persians, Turks & Mongols), but we'll see how it would look from a balance point of view.