The fall of sedition last year (1401) caused many political and sociological analysts to raise the question that why and to what extent is the Islamic Republic of Iran willing to pay for women's hijab in society? In the meantime, some people, with a one-dimensional view, considered this issue to be merely ideological, and some others called it the government's policy to maintain its supporters. The aim of the current research is to investigate the main causes and factors of the importance and necessity of this matter in the system of the Islamic Republic. The main question is why the Islamic Republic system insists so much on observing a social obligation, despite numerous internal and external problems? This research investigates this issue with descriptive-analytical method and using library sources.The findings of the research show that the great importance of hijab among the imams of the revolution as the outliners of the general policies of the system, which is also based on considering the advantages and disadvantages of this matter in their eyes, is the most important reason for this. Sociologists and intellectuals of the society have also put forward reasons such as the cultural image and identity of clothing, disruption of the system and the priority of social rights over the individual regarding the necessity of clothing, which supports the view of the Imam and the leadership on the issue of women's clothing...