Make sure that the thread tension is firm but not too tight as well. Having tension that is too tight may result in broken thread, while loose tension may result in sloppy stitches. You may use any type of thread for this stitch. The zigzag stitch is often used as a decorative one, so using a contrasting tread may produce an attractive result. For example, you could use red thread on a blue skirt hem, or secure the edges of a purple blanket with yellow thread.
On most machines, the zigzag setting will be represented by a straight up and down zigzag stitch. This is the setting for the regular zigzag stitch. Choose this setting versus the one that has a slight slant to it.
The width refers to how high your peaks are in the zigzag stitches. The length refers to how far apart each zigzag stitch will be.
Make sure to hold your fabric in front of the presser foot and behind it to guide it. Do not pull on your fabric, but keep a firm grip on it and keep it flat.
Make sure that you do not press too hard on the pedal. Sewing to quickly may result in a sloppy looking stitch.
You can also use the zigzag stitch to hem items and prevent them from fraying. Use the zigzag stitch in place of a straight stitch when hemming skirts, pants, sleeves, or other items that require a hem.
