This section is from the book "School Needlework. A Course of Study in Sewing designed for use in Schools", by Olive C. Hapgood. Also available from Amazon: School Needlework: A Course Of Study In Sewing Designed For Use In Schools.
1. Crease a narrow hem.
2. Holding the wrong side towards you, fold and crease the cloth, so as to make it even with the first fold of the hem.
3. Proceed as in overhanding.