Perfect hem line - draw a line on card stock, 1 inch in from edge of card stock. Place the card stock on fabric, with line parallel to fabric edge. Fold fabric over card stock, aligning fabric edge with line; press with an iron.
The rolled hem presser foot is just another amazing little device that makes my sewing life a million times easier. Using this sewing machine attachment makes hemming sheer and slippery fabrics an absolute breeze.