The following method produced an effect where the fold crease is towards the front, and the final topstitch is towards the back.
- Place fabric right sides together.
- Take the seam allowance of the front side and fold it back over the back side.
- Seam while trying to catch the very edge of the front side seam allowance. You should be sewing on the wrong side.
- Turn fabric to right side.
- Making sure seamed allowance on wrong side is covered, topstitch seam. You should be sewing on the right side.