Overcasting is done by taking loose stitches over the raw edge of cloth from right to left to keep it from raveling. The depth of the stitch depends upon the material to be overcast, usually an eighth of an inch is sufficient. The stitches should be twice as far apart as they are deep. The needle is inserted from the under side of the cloth and points a little to the left, making a slanting stitch. Keep the spaces even and the stitches of equal length. Always trim the edges before overcasting. Do not overcast a selvedge edge. Take only one stitch at a time and be careful not to draw the edge of the cloth. See illustration page 67.