Although a modular design which is one of eco-fashion innovation well known in Europe since the eighties (1980s) and early nineties (1990s) of the twentieth century, it does not receive enough attention and is still not noticeable in the fashion design community in Egypt. So, the importance of this paper lies in identifying this design method, and to what extent it can be used to develop women's fashion design. Also, this research paper aims to add this design style to academic studies and design libraries, and make it familiar in Egypt's societal culture, through the use of one of the most important symbols of Egyptian identity taken from Islamic art which is: units of "Islamic Geometric Motifs" adopted in their construction to repeat one simple geometrical unit. The study searches in how to deal with the structural composition of Islamic decorative units based on a specific repeat pattern (horizontal, vertical, axial or circular). In this paper the modules are based on a group of a simple Islamic geometric shapes in which they pieced together via small slices in a variety of configuration, to create different structural forms liable to be interchangeable depending on assembly / disassembly manner. As a result of studying such motifs, the researcher can only assume that this study will help reflect the aesthetic values of Islamic geometric motifs and enables the Designer to edit and control its content freely to create unique designs that can be used for women's fashion using one color for age (30-40).