Existentialism has emerged from among many philosophies because it focused on the fact that man should have his own essence and uniqueness, where he can change one's values and be responsible for it, regardless of society's values, as stated by Sartre; the most important existential philosopher, who he linked between human existence and freedom by considering the freedom as the core of existence with which man can express his own existence. Women had suffered from suppression of freedoms and absence of inequality for a long time, thus they found it difficult to achieve their purpose of existence. Moreover, the feminist movements, which recently exerted great efforts, were seeking to unify the concept of rights and liberties that proved to be ineffective with all groups of women all over the world. Therefore, this research aims to introduce Modest Fashion designs that suit women who prefer modest fashion, while observing the different interests of all women without marginalizing one group at the expense of another, and emphasizing women's right to choose in light of Existentialism. The significance of this research springs from its contribution with design ideas for designers, that would help promote the Modest Fashion style, while highlighting the diversity of interest between cultures and different clothing preferences. The research also fosters the society's involvement in fashion designs, and enriches the scientific library by linking Existentialism to Modest fashion. The research has presented three innovative designs based on design elements and basis, in order to achieve the aesthetic and functional aspects of garments through the technical experimental method that relies on designs' aesthetic making and analyzing, observes how the artist deals with the materials, and records the artist's artistic experience and sense while dealing with each material.