1 yard of fabric
Put the pillow in the center of the fabric and fold the fabric so that the overlapping fabric edge lines up in the center. I folded the end of the sides twice to make a point. Also tried to capture those folds in the picture below because explaining folds isn't my forte.
After the side folds, your pillow/fabric should look like this:
Fold the two sides over each other:
Tie the sides into a knot:
Safety pin the knotted fabric under the center of the knot to get this nice clean look:
Next, I will tackle a pillow with the sewing machine. You have been warned.