You can't really benefit much from the existing Republic textures when trying to transform the Sith uniform, the texture layouts are completely different. You can transform/rotate parts but that destroys the quality. You'd probably be better off just creating something from scratch and using those textured models as inspiration. But for me that's too much work and it's not something either of us want to do.
So, how about this?
(screenshot from the model viewer, will look better in game)
P_SarnaB01.tga