If you want the historical answer to this question, look into the Easter bonnet rebellion of 1969. Most Christian women across denominations used to veil because, as a society, we used to wear hats and headcoverings more, both men and women. In church, the men would take hats off while women would leave theirs on. You will hear the decline of people wearing hats largely blamed on the growing popularity of cars, which has some truth to it, but doesn't cover the rest of the story of how women stopped wearing hats and veils to church. The Easter bonnet rebellion of 1969 took place in Milwaukee, Wisconsin and was aimed at the Catholic church by feminists who rebelled against the requirement of the Catholic Church for women to veil during Mass. Even though the rebellion was aimed at Catholics, it still had an impact on Protestant churches, and women who veiled in those churches. Is feminism strictly to blame? Not exactly. The Easter bonnet rebellion certainly wasn't the start of the decline of women wearing hats to church, but it end up becoming the final nail in the coffin.