A common long sleeved, button up, cloth garment for the upper body made from a polyester and cotton blend that has been dyed black.
The basic shirt is a staple of any survival gear, and should be kept clean, dry, and serviceable. When dealing with shirts, search out those with neutral or earthy colors, as this will make it easier to blend in with nature as you move through the forest. While entering populated areas, greens and greys will be your best choice.
It can be ripped into Rags.