Lux's boobplate
Have you ever thought that she wore one just because she wanted to increase her boob size? This doesn't apply to many of the other female champions with the feature, but lux has always struck me as someone insecure enough to want something like this. Not to mention she doesn't really need armor seeing she's a long range mage.
But there are some other boob plates that I wouldn't mind too much being removed... (I also wouldn't mind lux's in game boobs being a little smaller and look like they actually have a boob plate instead of just cloth colored to look like metal)
Anyways, just saying, these aren't all military soldiers dressing in optimal battle gear, a lot of these champions are there to have fun. And it's not fun if you can't wear what you want and have to wear heavy, stuffy armor all the time. Which is why I think Ashe's, Lux's, MF's, Ahri's etc.. designs are fine. But that being said, I do hope that most of the new female champions are more serious in regards to what they wear seeing that most of the original champions are the more "undressed" type.
Edit: Yay for downvotes without explanations