When can the brown/tan T-shirt be worn as an outer garment?

The correct choice indicates that the brown/tan T-shirt can be worn as an outer garment when specifically approved by the commander. This means that the decision to wear this T-shirt in that capacity is not left to individual discretion or standard situations; rather, it requires formal authorization. This approach ensures uniformity and adherence to specific standards or regulations that the commander may want to enforce, maintaining professionalism within the organization.

In contexts where this T-shirt might be suitable, the commander's approval serves to clarify the purpose and appropriateness of its use, ensuring that it aligns with the unit's standards of appearance during various activities or events. This structured approach allows for flexibility while still upholding a level of control and oversight regarding uniforms and outer garments.