Man, I tell you what, I don't know how people think Ivy looks good. I mean the new costume is waaay better than in 3 and 4 (though, I still don't like it, it looks like a chopped up penguin suit stitched together to look between her SC2 and SC4 versions), but that's not the issue.
The problem is Ivy still looks like a dude. 'Her' face is (still) masculine, and she has no curvy figure (lack of clothing=/=feminine figure). It's far from the Ivy I liked in SC2, and is the total opposite of sexy (unless you like transvestites). If you deflate those ever-growing breasts, took out her makeup, and gave her a Mitsu-ish stuble, she would be really expressing her true self.
I joke with my friend (an Ivy main), telling him that her real name is probably Fredrick or something, lol.