Charliehall, stop bringing up far-off shittos. One can find those on many shailos. The Gemora states explicitly that if a wife does cover her hair, the husband should divorce her.
Harri, the divorce applies to the aveiros that could affect the husband. If she dresses not tzniusdic, we are worried it may come to worse things r”l. Still even about other aveiros, he should be moche.