This is more towards the representation of Sauron in the films. If one watches carefully, in BluRay to be specific, one can see the rich tapestry woven in Sauron's costume which closely resembles what we see in Elven costumes?

Considering Sauron and his army, which we see at the Black Gate there is a huge contrast between the orcs and the Urkhai who are all in rags and shambles so to speak.

Richard Taylor in one of the interviews on the Extended Edition disks says that the orcs made their armor with what they could gather from leftovers from war so the design follows that arc.

But what about Sauron's costume? Why did it have such a rich tapestry?