WHAT IS IT?
A turned-and-stitched seam finish is a way to finish seams or edges by turning under the raw edges and edgestitching them for a clean, flat finish. It may also be called an edgestitched (page link) seam finish.
WHEN DO YOU USE IT?
This seam finish is great for stable lightweight fabrics like cotton or linen. If your fabric presses well and holds a crease, this is a good solution for finishing the edges.
HOW TO DO A TURNED-AND-STITCHED SEAM FINISH
Sew the seam with a regular 5⁄8″ (1.5cm) seam allowance, backstitching (page link) at the start and end. Press the seam open.
Tuck under the raw edge about ¼” (6mm) along one side of the seam allowance, and press in place.
Repeat with the other side of the seam allowance.
Take your work to the sewing machine. Arrange your piece so the garment layers are all to the left and only the seam allowance layer is underneath the presser foot. You’ll be sewing a mini-hem on each side of the seam allowance in this step. Sew close to the folded edge, all the way from top to bottom, and backstitch at both ends.
Sew the other side. Backstitch at both ends again. Press the seam flat one last time to set the stitches.
Source : The Sewtionary An A to Z Guide to 101 Sewing Techniques + Definitions
About the Author : Tasia ST. Germaine