Summarize this article in one sentence.
For the bun, you’ll need a rectangular scarf. Carefully create  a thin band from it by folding it in on itself lengthwise several times. The finished band should be 2 to 3 inches (5 to 8-cm). Once the scarf is folded into a band, place it around the base of your ponytail. Tie it into a knot over the hair elastic so an equal amount of the scarf is on either side of ponytail. Ideally, you should use a scarf that is roughly the same length as your hair when it’s tied around the ponytail.

Summary:
Fold a scarf into a thin band. Wrap the scarf around the base of your ponytail.