Afghan Tan, also known as Afghanistan Tan, is referring to a big piece of land which belongs to Afghanistan. Since there is special piece of land in Afghanistan, it is not very fertile. The second meaning is a woollen blanket or shawl, typically one knitted or crocheted in strips or squares. (From Oxford)
It is hard to decide whether Afghan Tan should lean on which most because both woollen blanket and Afghanistan matches this color. In the picture, the woollen blanket might match the color more. The most important keyword in this color is "tan" which defined this color as the blanket. Therefore, we might say this color is more like woollen blanket.
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