Pocket Tees may be a little redneck for some people, but I am loving the Carhartt "Force" shirts. Moisture wicking or what ever like under armor, but not so tight.
Regular Carhartt work tee shirts are good too. They are thick, but stretchy material. Go 1 size smaller than you normally wear if you mess with these.
Get 1 red, 1 blue and 1 grey and you are set!