Now, remember seam allowances may vary; I always use 3/8”. So, you will begin by placing two pieces of fabric, right sides together and running a straight stitch 3/8” inside of the edge. I like to run my straight stitches at a stitch length or three. Play with your lengths until you find one you prefer; usually, somewhere between 2.5 and 3.5.I will cover two finishing methods, but keep in mind, there are several more. These are simply simple.
After you have sewn your straight stitch, you will use pinking shears and trim the edge of the fabric just outside of the seam.
Once you have sewn your straight stitch, run a narrow and short zigzag stitch along the raw edge, just outside of your straight stitch.
You may or may not choose to sew these seams down with a top stitch. Many regular machines also have an overcast stitch that will secure the edges of your fabric, much like the zigzag. It does a great job of finishing the raw edge, but it can be slow and may use more thread. The symbol looks something like these, but consult your machine manual.