If you maintain your practice of dressing and acting appropriately, your children will follow suit. Begin to grow slowly and delicately in the tznius realm, and your husband is likely to change for the better.
I hope my suggestions are helpful. Please consult with a rav concerning any halachic or hashkafic issues. In addition, a frum therapist may help you spice up your marriage so that other possible underlying issues can be addressed – and solved. Hatzlachah!