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To fold a bandanna, you must take the right or left upper corner of the bandanna and fold it down to the bottom left and or right corner, respectively. So, upper right to bottom left or upper left to bottom right. You end up with a triangle. If you like the 70's look, take that triangle-looking bandanna and tie it around your head as is, with the flat part on your forehead and the ends at the back of your neck. If you are looking for an 80's gang look then you fold the bandanna from the flat part down in 2 inch rectangles until you are left with only one rectangle. Then tie that around your forehead.
franduby, Answers Expert