|Image found HERE|
Star Wars had a significant 1940's vibe to it - it was very much a recreation of 1940's sci-fi serials and WW2 movies - with some Akira Kurosawa thrown in for good measure. Okay - the cantina music was more 1920's, and the 1930's fills in as well - so maybe we'll call it a 1920's to 1940's vibe. Now, one cannot remove the design of a piece, even a pseudo-period piece, from their own time and place. That makes it an interesting mix of 1920's-1940's and late 1970's design (and boy, can you tell that the second and third movies were designed in the 1980's). The "seventies meets the past" look was nothing new, really - there was a definite interest in resurrecting the 1920's through 1940's look in that era, with a modern twist.
Luke and Leia appear to be about 18 years old or so, so the second trilogy should be taking place about two decades earlier. What I think would have been cool, then, is to make the second trilogy look very 1900's-1920's.
I guess what I'm getting down to is this: What might a very "early 20th century" Star Wars have looked like? A very aristocratic Galactic Senate in old fashioned military uniforms - a doughboy vibe to the soldiers and proto-storm troopers - bobbed hair on the ladies - a little more ornamentation on things than was necessary, that transition from the Gilded Age to Moderne - more of an Egyptian style to things - a waxed mustache on Yoda. Perhaps some of these elements were present in the second trilogy.
I don't know quite what it would look like, but it makes me wish I was an artist so I could explore the look of the thing.