Rolled hems are usually associated with an overlocker or serger, but it can be done on a sewing machine using an overcast foot.
The perfect finish for scarfs or tops made with fine fabrics.
This video from U Tube uses two pieces of fabric this technique can be used for
edging on a single layer.
On the white fabric
to show how we got the effect we start with an average E stitch on a J 24.
Then the stitch length was reduced
to under 1 (test this out on your machine) to close the stitch.
Green silk same technique
Both sewn on single fabric
Overcast Foot For
Snap on foot