Duplicate stitch
The duplicate stitch is worked over the finished knitted fabric. It is most often used on stocking stitch, and replicates the look of the stacked columns of V stitches. You can use the duplicate stitch in the same way you would use embroidery; by using a different colour you can add a decorative element to your project. Alternatively, the duplicate stitch creates a double layer of fabric, so if worked in the same colour as the base layer, it can add reinforcement to weaker areas of your project.