If you’ve been around a while, you know much I hate to create hemmed/clean edges. But it’s a must, so we will do it. 😉 All you really need to do is turn the sewn edge towards the wrong side of the fabric, like the picture below. You can do the entire edge, and pin as you do that, or you just fold it down like the picture, and fold down as you sew. Use a straight stitch on your machine.