Easy Serger Bandanna or Scarf

I found a scrap of cotton fabric that was only large enough for bandannas, so that's what it became!

I started with a 22-inch square of cotton, which I bisected diagonally (wrong side shown here):

I then serged all the edges, and tied off the corners:

These scarves act as my helmet liners.  They are stored with other scarves I had made before.  Note how convenient they are to my helmet:

That was very easy!