How do you determine the laws of modesty when they are subjective? Question about column 499 (A look at modesty and its meaning)

You assume that halakha always operates with rigid rules, even if subjective. But this is not necessarily true. For example, the laws of loving and fearing God, loving one’s neighbor, honoring parents, adhering to the commandments of God, the Blessed, and more. All of these depend on circumstances and it is difficult to establish sharp lines in them. And this applies to the laws of zisudan in the mitzvot of the Torah. Modesty is not a mitzvah specified in the Torah, and therefore there is no reason at all to look for rigid rules there. Of course, it is possible in principle to establish rules in a certain place and time (if there is an authorized entity to do so), but this would not be universally valid for any other place and time.