Managers’ psychologically defensive workplace behavior (PDWB) are a common scenario in the apparel manufacturing sector because of the expanding global sourcing and supply chain structure, buyers’ negligence of labor regulation and workplace conditions, and the difficulties in monitoring apparel manufacturing sites located offshore. Years of experience and job stress induced from workload play a key role in the inception of PDWB, leading to job dissatisfaction. In the Textile and Apparel setting, the workload typically depends on the number of workers to supervise and the volume of work orders. Therefore, this study was designed to explore whether such work experience and job stressors would be related to managers’ PDWB. The results show that when supplier managers have to complete large order volume, they tend to be more strict, manipulative, and even become unethical, which falls under the Arrogant-Vindictive PDWB.