Nechomah – There is certainly no reason why both can not be done, but not the reasons of Tznius masquerading as Halacha or even worse, changing it.
I had a discussion yesterday with my (non-Jewish) barber about Tznius, and how women these days dress in the street like they are offering themselves for hourly lease. It certainly is a “reason” to keep Tznius (just like any other reason you might suggest), but it doesn’t suffice, because it gets into some real questions. Why no jeans? hair? Slightly above or below the knee? Socks? Dressing like Princess Kate? That is why we have to teach what the Ribbono Shel Olam wants, not some rabbi, imam or “community” standards that are not immutable Halacha.