Total Quality Management (TQM) is a quality management tool for improving quality by addressing issues related to the entire production process. It involves the process of detecting wastes occurred on a regular basis to improve the product quality to increase customer satisfaction. This paper has explored the application of TQM tools to identify defects in the sewing line of garment industries and addressed such issues using SOP. In the garment industry, sewing defects still significantly impacts product quality and overall efficiency of the industry. Data on sewing defects occurred in production of a polo t-shirt are collected over a specified period using a check sheet, providing an insight into defect frequency. These data have been visualized through histograms to illustrate the distribution and highlight the common defects that has occurred in the production of the item. A Pareto analysis is then performed to identify the "vital few" defects that are contributing to the majority of quality issues. And for these identified critical defects, a Cause-Effect diagram is used to analyze the root causes and their interrelations. The outcome of this study has shown how implementation of Standard Operating Procedures (SOP) against these identified 20% of defects that are causing 80% of the problems in the sewing line, has significantly improved the quality standards and has also increased the 5S score from 102 to 163. With application of these TQM tools, this research contributes to reduce sewing defects, improve product quality, increase 5S score and ultimately increase customer satisfaction.