Press the seam open and turn the sash. Use the end of a table knife or ruler for turning. Press the sash flat, keeping the seam at the edge. Make the corners square.
If you prefer to hem the sash, make a ¼-inch hem, miter the corners. See instructions on scarf, pages [7] and [8].
Press and stitch hems
Side hems
1. Make a ¼-inch hem on each side of the apron. To make a hem, press a ¼-inch fold on the side edges of your apron (20-inch sides). Press with your fingers, then with the iron.
2. Fold edge over again ¼ inch and press. Stitch along edge of hem. This completes the hem.
Selvage edge—If the selvage is used, clip only the very edge of it every 2 or 3 inches. This prevents puckering when it is laundered. Fold the edge over ¼ inch, press and stitch. A double hem is not needed.