Art Nouveau style refers to the movement of art which was started in France and Belgium in the last decade of the 19th and the early years of the 20th century. The distinguishing characteristics of Art Nouveau style are the sensous sinuosity of its line, nervously undulating, curving over itself, rhythmical, flowing in endless patterns, which are inspired by animals and plants, specially by flowers, leaves, long stalks. The Art Nouveau style includes also the extreme simplicity of form, and asymmetric design. This new trend of art movement spread into architecture, furniture, wall papers, graphic design, accessories and textiles. In this paper, I tried to find out whether or not the Art Nouveau style had an effect on clothing. Because I believe clothing, like architecture, painting, and sculpture, is an Art form that derives from a particular set of cultural circumstances and reflects the needs and aspirations of the society for which it is created. Fashions in clothing over the last five thousand years have mirrorred the art form as well as the spirit. The result of this study shows that the Art Nouveau style made a lasting contribution to the modernism of clothing as well as architecture and interior design at the end of 19th century and the early years of the 20th century. The modernism of clothing appeared in the straight silhouette, asymmetric design, simple and light trimming, embroidery with Art Nouveau pattern, and stylized flower design in textile. Art Nouveau made a great contribution toward the modern clothing to have its liveliness and its harmonious relationship between clothing design and the use of materials.