To be fair, she doesn't do the fight and just there for the guy to pull huge-ass sword from (maybe the cut-out helps?). Also, she's kind of a net idol in the setting, or something.
I've seen alot of leotards, bikini armor and other fantasy themed outfits on cute girls over the years. Outfits that I do find very appealing.
It's just that one should never stop and think realistically about such an outfit in such a scenario but sometimes I can't help myself. Every time I see Inori in her idol get up I always remember the scene of her restrained and blindfolded around the start of GC. The scene would have been a perfect set up for lewd times if GC was a hentai but here not one guard made a single comment that I recall.
Much of the outfits for the master race of the Elin leaves little to the imagination and I love them for it.