Fold the bandana diagonally. Put the broad part up. Tie the edge of a sliding knot, tighten slightly.
Put the rope on his shoulder. Tighten the knot sufficiently tight, so that the bandana didn't fall over, but not too much, otherwise violates the bloodstream.
Different way to tie a bandana on hand. Fold it in half (vertically or horizontally), screw in one turn to make the helix from the tissue.
Pass the wrist in the center of the spiral. Tighten the ends, put one on the other to lower slightly. Kill it with a brooch, a clip or barrette.