What colour T-shirt is appropriate for wearing with the No.3 uniform?

In the context of RAF uniform regulations, the appropriate colour T-shirt to wear with the No.3 uniform is black. This specific colour is designated to maintain a dress code that is consistent and aids in projecting a professional appearance.

When a black T-shirt is worn under the No.3 uniform, it serves both functional and aesthetic purposes. It helps in concealing any visible undershirt while also providing a sharp contrast that complements the overall dark tones of the uniform. This choice aligns with military standards for uniformity and discipline, which are key principles in the Royal Air Force.

Other colours, such as white, blue, or grey, do not conform to the specified guidelines and could detract from the uniform's intended professional look. Uniform regulations are essential in maintaining order and cohesion within the ranks, which is why adherence to the designated colour for undergarments is important.