Well the royal queen of naboo's costumes were obviously based on Asian designs or have an Asian feel to them.
The headdress thing is like an exagerrated version of the big Leia hairbuns in star wars 77 and is supposed to show you where Leia got her style. You see Leia is supposed to dress like her mother, and Luke like his father. At the end of the day though i think the costumes were different than those in the oot because Lucas asked John Mollo to make costumes that did not draw attention to themselves.
Imperial Stormtoopers being Conscripts of Conquered worlds or out of the Imperial Space Academy is entirely EU derived. The Imperial Space Academy part coming from the Radio Drama When Biggs mentioned he was going to Jump ship and join the rebellion before being drafted into the imperial starfleet.