Finish seam allowance edge using a hand-applied blanket stitch
A blanket stitch provides an effective way to contain fraying seam allowance edges by hand while also providing a semi-decorative finish to the garment's seam allowance edges. A blanket stitch is type of hand-applied overcast stitching that is applied over the fabric edge leaving behind a row of vertical stitches and a straight stitch directly along the fabric edge.
1. Start by stitch in place a few times within the seam allowance to lock the threads.
2. Next, insert the needle through the seam allowance layer (from front to back) and position the thread behind the needle as shown above. The stitch should be inserted at the desired stitch length (measured from the fabric edge).
Pull the stitch through- the thread look should be positioned behind the thread as shown.
Continue applying the blanket stitch, positioning each loop behind the needle as you pull the thread through. As a result, a straight stitch will line the fabric edge while the stitches located along the body of the seam allowance align vertically as shown. As you apply the blanket stitches, try to maintain the same length and density throughout for a clean, professional finish- this will take some practice before you achieve the perfect application.