Also a woman can be as modest as she wants to but if she believes in the Marxian and Jєωιѕн principle of feminism then the modesty outside of the body is null.
I agree. It would be as how Our Lord anathematized the Scribes and Pharisees: "Woe to you scribes and Pharisees, hypocrites; because you are like to whited sepulchres, which outwardly appear to men beautiful, but within are full of dead men's bones, and of all filthiness" (S. Matt. cap. xxiii., 27).
However, I have never met a woman who dresses modestly and yet subscribes to Marxist and feminist ideologies. Such a thing would be as rare as the dodo bird.
Ineluctably, just as belief determines behavior, so behavior (particularly when repeated to the point of habit) influences belief.
I have met young women who are of "conservative" Protestant sects who do dress modestly, but they do not espouse feminist notions. Perhaps on account of this they dress modestly. However, since they do not have Our Lady as exemplar and patroness, some of these young women do not always persevere in modesty of dress or comportment, as the pernicious influence of the world and the concupiscence of the flesh compel them to abandon wholesome habits of dress.
This is the most important thing for Catholics (both women and men, boys and girls) to remember: an earnest and generous devotion to the Blessed Virgin Mary will inevitably lead to the self-abnegation and mortification of the senses and the will that shall enable one to be modest in both dress and comportment.
True devotion to the Blessed Virgin Mary ---> self-abnegation in all things ---> interior and exterior mortification ---> modesty in dress and comportment ---> prayerful perseverance therein : this is how it usually works in most interior souls.