I think that one of the problems is that the Bais Yaakov’s installed a uniform policy instead of dealing with tznius in the school. This is a good and easy solution in the classroom but what are the girls wearing at home and on shabbos? Maybe we should have a no uniform policy but you have to buy clothing that fits with the school standards and skirt lengths.
I also think it is very important for mothers to wear long skirts and be an example for their daughters. And husbands should tell their wives in a gentle way that the skirt is too short and he would like her to wear longer skirts.
I was at a shivah house and frum women came in with short skirts and when they sat down it was REALLY not tznius. I felt like giving them a blanket or something to cover their legs because nebach they kept tugging and pulling down their skirt to cover but to no avail.
May Hashem send us the strength we need to fight all our Yaatzer Horos and send the geulah!