Anyone know where a definitive answer can be found as to what color t-shirts are acceptable to wear under the uniform? When I went through the driver class 2 years ago we were told white, brown, or black were acceptable. A class that recently went through the class was also told that white brown, or black were acceptable. However in my center guys who come in with a black t-shirt are getting chewed out for wearing black. The on-car makes it a point even at the PCM to go around and point to the guys wearing a black t-shirt and say 'black....black....black' I yelled out that this was beginning to sound racist...... But I would like to find out for sure and if black is allowed or not.