first Still working with the seams outwards (good sides facing inwards), match the open edge of the fabric.
2nd Sew the edges together, gently loosen the strip as you pass each one and sew / back stitch each strip several times securely.
3rd Continue sewing down the edge of the fabric and repeat step 2 each time you pass a garter.
4th When the edges are sewn together, cut the strip with scissors.
You're almost ready for the caterpillar!