Sexist? It's not sexist unless you think along the lines of "a woman's place is in a metal bikini!" It's no more sexist than a girl being tied up, or in handcuffs, or wearing a collar, etc, etc. What's sexist is thinking of that as a woman's natural state. What's sad is that I think a lot of people honestly believe that. :(
But no, metal bikini =/= inherently sexist. I agree wholeheartedly; that thing was the sex. And big nasty Jabba pulling on that chain leash? Yeahaaa.