While much of Star Wars has gender problems (erasing the female pilots from the Battle of Yavin, for example), the appearance of Princess Leia in the costume in Jabba's palace and on the barge in Return of the Jedi is actually not un-feminist.How so? Well, one could argue that this was just providing the fanboys of the movie with something to gaze/leer at, it is actually more complex. Jabba had Leia wear this costume as part of his effort to dominate her. Jabba is gross, disgusting and vile. So, we should find his enslavement of Leia and his disrobing of her to be awful. Indeed, one could argue that Jabba is a personification of patriarchy--that he is all lust, greed, and domination in a slimy package.
And what happens to this depiction of patriarchy in the movie? It gets slayed, choked to death, by a woman who uses her own chains against her target. The only help Leia receives in this effort from the men around her is the provision of a distraction. Luke's deployment of the force does not liberate Leia, but only catches the attention of those around Jabba--he is the Jedi squirrel! The hard work of killing Jabba, of freeing woman from patriarchy, is done by Leia with her own bare hands.
So, one could look at the iconic image of Leia in the bikini as sexist and harmful to feminism, or one can look deeper and suggest that she is a feminist icon for slaying the enslaver of women, green or otherwise.
As for the rest, well, yeah, George Lucas has some problemos.