I've never seen any star wars themed items for sale in any MPs, asside from character sets that resemble actors from the films (like a natalie portman clone here in the MP), cause that would be illegal without license. But there are a lot of classic styled star wars items for free on sharecg and several other places. At least there used to be. However they may show up and disappear and then pop back up somewhere else because I know that some branch of Lucas Film was actively seeking out star wars-related images and other content online serving cease & desists for a long while, to anyone that wasn't licensed for it, regardless of whether it was free or not. Fan sites, everything was being shut down for a while. I don't know if they're still actively working on that, but it could be why you're not having much luck.

I'm sure you can still find sabers and robes and other more generalized stuff, but you'd probably have to piece together an outfit. The head tails would likely be the most difficult part to find. 

You might want to consider using the Girl for Ahsoka, since her shape is closer to the stylized shape of the clone wars characters. That is unless you're going for a more realistic look. Just an idea.

Sorry I don't have any specific resources for you.

 

~Shane