I know you've selected the outfit we first see her in after her statue appearance. But there's also a second outfit she's seen in towards the end of the film. In fact, I came across a
blog that has some pictures from fan-made costumes.
I agree with Mostly Fantasy, you'd have better luck with vacuum forming the chest piece so that it has the correct appearance.
As for how to construct the costume entirely, it's really hard to say. One
tutorial I've come across from eHow suggests using brass craft sheeting. I don't know how useful eHow is, but it's certainly not RPF.
Another resource to consider is Cosplay.com, as I did find at least
one user who made a costume. In fact, one of the users named LadyMuramasa did sort of a
small video about how she constructed the head piece (it's more of a WIP vid than a tutorial or anything like that)
I found
one site that has this ridiculously overpriced costume that I doubt is even screen accurate.
I don't know if I'm being at all helpful, but I figured it'd be best to share these links so you can form some ideas on how you want to construct it and to share potential methods of how to construct it (though there's not an exact tutorial, just looking at some of the pictures show what others have done to at least get a decent version of the screen outfit).