An excellent shiur by Rabbi Dr. Akiva Tatz, who gave the contrast between two time periods - prophecy and after the end of prophecy. During the period when prophecy abound, spiritual beauty was reflected through physical beauty. People who were beautiful for example, Sarah Imenu, was able to reflect her true spiritual beauty.
G-d's revelation through prophecy and open miracles abound. The post-period of prophecy when it ended reflects the hiddenness of G-d in the world and spiritual beauty is hidden inside the physical body. In order to reveal this spiritual beauty, the physical body needs to be clothed modestly. Rabbi Tatz reminds us that it's the Jewish women, the righteous Jewish women who are going to bring about the final redemption of the Jewish people through their modesty. There are other insightful gems from this lecture that you should not miss that only Rabbi Tatz can dazzle you with.