To fold a bandana into a headband, spread it out flat and then fold in diagonally from opposite corners. Folding will create a smooth headband with no bulk or floppy loose ends.
Step one: Make the first fold
With the bandana flat on the table, imagine a diagonal line running across it from corner to corner. Fold the opposite corners in to meet in the center of the bandana.
Make the second fold
Make another set of folds so that the two newly-formed straight lines meet in the center. The shape will be similar to that of a short necktie.
Step Three: Make the third fold
Fold the bandana in half up the centerline of the headband. Then, tie the headband on the wearer's head as desired.