Apparel manufacturing industries are trying to develop their current production system. In Sebrom Garment Company, sewing section faces the problem of fulfilling targeted production plan since there is no precise work distribution flow by the worker and material travels long distance from station to station. The objective of this study is to improve the sewing section efficiency through capacity utilization of worker by using work study. The author conducted and collected primary and secondary data from case study firm. Research design is the overall plan for connecting the conceptual research problems to the empirical research. The gathering empirical data was quantitative and qualitative. The quantitative data was collected through direct observation of the production floor. The data focus on a production line sewing section. Qualitative data was conducted interviewing different management level such line supervisors and technical manager. Quantitative data was analyzed by using software like MS Excel, and auto CAD with the application of the balancing process and the data analysis was done and compared with the standards. Three lines are selected one line with trouser manufacturing as a sample for the study since the production was more in this product. By applying performance improvement system, bottleneck process, giving training for operators and modifying working method Sebrom Garment company improved its SMV (standard minute value) by 15.8%, daily product 19.1%, production cost by 19.4%, line efficiency by 20.66%, productivity (product per operator) by 20.6%, capacity achievement by 17.54% and performance rating 20.35 %. The findings can be extended to similar apparel industries in future. General overviews to these works are presented in this paper