Observing Judaism means keeping the Mitzvos of the Torah.
I hear this all the time:
“Why are you complaining about this sin? What about the sin of so-and-so and so-and-so and so-and-so?”
The fact that other sins against the Torah are committed does not make the lack of Tznius permissible. These sins obviously need to be dealt with; but the specific issue that is being dealt with in this thread is the serious sin of the lack of Tznius, C”V.
The book, “Daughters of Dignity,” explains the Mitzvah of Tznius from the Torah, the reasons and rewards for Tznius, the consequences and punishments for the lack of Tznius, C”V, and the rules of Tznius.
Eating Kosher is a Mitzvah of the Torah. Shmiras Shabbos is a Mitzvah of the Torah. Tznius is a Mitzvah of the Torah. Period.