Why dont bais yaakov girls wear pants? Why dont their mothers, frum Jewish women, waer pants? Virtually none. Why? Because theyre not allowed to, not because they dont want to. EVEN amongst the modern orthodox their women dont wear pants, except the borderline religious who barely keep Shabbos.
Whats considered “common” is what is common in frum Jewish society, NOT whats considered common in gentile or irreligious society.