Playing with the controls: Tati's Play Time; Lucas' Star Wars
At the gap: M. Hulot; the Skywalker twins
Addendum: I have always enjoyed the idea that Leia's buns were an homage to 19th century Mexican revolutionaries, or as Lucas put it, “a kind of Southwestern Pancho Villa woman revolutionary look.” I recently read a post by Belle Beth Cooper - that aims to be "The ultimate analysis of where Princess Leia’s buns came from." Cooper's post is great. She tracts down images of the ‘squashed blossom’ hairstyle of Hopi women, as well as bebunned images of Batgirl, Flash Gordon's Queen Fria, and (least convincingly) a frumpy character from Dambusters - but I would politely disagree, call Cooper's post "Penultimate". While I believe Lucas was striving to make Leia's look at once timeless, and at the same time jibe with the look of 60s and 70s radicalism of political radicalism, any "ultimate analysis" has to at least include Martine's blond buns from Jacque Tati's 1953 film, M. Hulot's Holiday - even if this is just a thesis, and not a proof.
Nathalie Pascaud in Les Vacances de monsieur Hulot (1953); Carrie Fisher in Star Wars (1977)