"If you and your partner are not happy with how the girls are dressing, address it as parents, but don't kid yourself that you are doing it for any other reason than the fact that you believe that some women invite sexual assault by the way they dress and behave - which is basically what you've said here."
This is ridiculous and unfair.
I am a staunch feminist. It is NEVER the fault of the victim. Nobody, especially a child, invites rape or assault. Even if they're buck naked at a party/ drunk out of their skull/ give in through coercion because they are scared - it is ALWAYS THE RAPIST'S FAULT. Sorry for shouting that, but just so we're clear. It is never, ever the victim's fault.
Holding this in mind, I still am of the opinion that it is not a feminist choice to bring up children to normalise emulating grown women wearing certain clothes to be 'sexy'. In a similar vein I also hate those kid's t-shirts with gross slogans on, and I hate folks who refer to their kid as a 'sexy lil man' etc. Puke.
Leaving out the issue of assault from predators, I massively object to anything that serves to draw children's attention to their sexuality before they are emotionally mature enough to deal with it, before they are ready for the complexities of expressing sexuality in a healthy way. So in the same way, I don't think it's appropriate to let kids watch certain films, or hear adults talk about certain things.
I'd be less concerned if this was something the kids were experimenting with along with other styles, different outfit styles and make up, in a creative sort of way. Especially as teenagers, because experimenting with sexuality and playing with how to express that is totally normal.