It's not like Samus lost her badass attitude having this suit? Any the people on the boards may be acting like horn dogs but I'm sure it's all for laughs. I see really no reason to be upset over this costume, but if its over the same argument for her "high-heeled" rocket boots then I'm pretty much done here.
All in all this "Justin Bailey" two piece has some big history in the Metroid line and this is an appropriate alts for Zamus imo. The only other thing could've been her army-like attire from other M, but that's not nearly as recognizable as the "Justin Bailey"
I have no problem with the rocket boots actually. High heels doesn't equal oversexualized to me and they were clearly added for her gameplay style and nothing more. This just is the type of stuff you don't expect Nintendo to do with her for the most part. Most of the sexualization of her comes from the media and fans, and this doesn't really help to stop that, but it's whatever.
It'd be only slightly less annoying if there was going to be gender equality where some of the guys have other similar alts (Not that that would be necessary either.), but that's definitely not going to be happening and we all know that.
Even Sakurai knew where this alt would go in most people's brains hence his need to stress it was designed by a female designer.
All in all this is just the kind of strange things that should be kept out of Smash in my opinion. ZSS didn't really need an alt. And no character really needs an alternate that puts them in a outfit that reveals as much of their skin as this one does.