The main objectives of this research was to identify and discuss the critical success factors for sustaining the lean concept in the MAS Holdings and to analyze the gap between the existing cultures of apparel manufacturing organizations and the acceptable lean culture. When identifying the contribution factors for a successful lean apparel culture, first of all, it has identified that the human resources play a vital role. Understanding how complex human beings are and understanding the contribution of them to sustain such a system is not easy. For that, first of all, the culture of the society in which the human beings are gathered had been taken into consideration. Hence, lots of literatures were reviewed base on cultural aspects. Then, since the research was based on the apparel Industry, some literatures also being reviewed and the perception towards the Sri Lankan Apparel Industry also taken to be consideration. Then again, as a main part of this research, Lean Manufacturing Concept was highlighted and required theory and the practical aspects were taken into the consideration while the literature review was going on and finally a background for the research was formulated. Base on that platform, the research methodology was designed. MAS Linea Clothing has taken as the framework for this research. The approach would be exploring the secondary data which is related to Linea Clothing with the platform of Lean. Under that two areas were explored as interns’ interview with Lean Advocate and results of the Lean Leadership Assessment Tool. And if there any contradictions with theories or the practical scenario, those discrepancies get cleared through the use of primary research where the Questionnaires and Self-evaluation surveys functioned.