Maybe Im wrong but I think that the only thing we can do is educate our children inside the home about whats right and wrong. Buy them books on Tznius and most importantly the mother has to be a good example of looking good while dressed Tznius.
It hurts me to say this but we have no Gedolim who have the power to do anything to change the situation. Im sure Rav Matisyahu Salomon can cry and scream until he is hoarse and at best a few people will listen and maybe dress differently for a few weeks.
The schools are not doing their jobs or what they are doing is just not working because its not enough. We need to fortify our homes.
I wrote this a few months back and I will say it briefly again. Our homes must be a sanctuary from the outside world. If we bring in the non Jewish shmutz like the news papers, magazines, music, tv, movies, novels….then we are polluting our senses and desensitizing our neshamos to purity and wholesome hashkafos ideas and ideals. A girl exposed to the junk of the non Jewish world (which is obsessed with sex and promiscuity) will automatically feel a pull towards untzniusdik dress. It will likely even be subconscious. She wont know why she wants it but she will want it strongly.
Its a huge problem but all I can say is that the people I know who are Tznius stay far away from the non Jewish shmutz media and entertainment.
You see my point is that untznius dress is not the cause of our problems its an effect of other actions. We need to cut things off at the root. The root is the connection to outside influences.
I may add that another powerful influence for a girl can be bad friends or friends who are headed that way and have started with the untzniusdig dress. So even a girl who has no access to non Jewish things (very UNcommon, there are “good” girls who read filthy novels that destroy their sensitivities) can still be influenced by bad friends. But it is highly probable that these girls themselves have been poisoned by non Jewish sources.
So bottom line if we want our kids to live up to a higher standard we have to live up to a higher standard an not allow certain things into our houses even for ourselves. The biggest hypocrites are the parents with the TV in the bedrooms who say “only for parents” most kids see right through that and lose all respect for the parents and frumkiet which they begin to see as fake and do whatever you want, make your own rules.