What must uniformed security personnel wear besides their cap?

Uniformed security personnel are required to wear a uniform outer garment as part of their professional attire. This is essential in order to provide a recognizable presence that instills confidence and reinforces authority in their role. Uniforms are designed to create a cohesive look among security staff, clearly distinguishing them from the general public and ensuring they can be easily identified in various situations, such as emergencies or routine security checks.

A uniform outer garment serves several functions. It enhances professionalism, promotes accountability, and can deter potential threats simply through its presence. The visual aspect of a uniform can also assist in crowd control by clearly marking who is responsible for security.

The other options do not meet the criteria necessary for a uniformed security professional. Casual clothing and costume attire lack the formal structure and standardization required for security personnel, while plain white shirts, while potentially appropriate in some contexts, do not fulfill the need for a complete uniform that includes specific identifying features essential for effective security operations.