Yes I know, but what is a cover stitch?

Cover stitch or sometimes called a cover hem?
A cover stitch appears on many shop bought clothes. It is a professional hem stitch that overlocks the raw edge on the wrong side and at the same time produces a neat even top stitch, usually, (two or three rows) on the right side. Many overlockers now offer this feature, using a different number of threads. Probably the most popular is the 2-needle, 5rnm wide cover stitch usually found on purchased clothing.