Trace the bottom of your skirt pattern, making a facing, measuring up the sides of the skirt 2 1/4" to 2 5/8". Make sure you have a seam allowance on the bottom of the pattern, so you have enough to sew the facing to the skirt. Cut out the facing piece following grain of skirt pattern. Serge the edge of the facing that isn't sewn to the skirt-- the edge that you will see inside the skirt.
You are doing great! Step two:
Sew the front and back pieces of the skirt facing together, and then sew to skirt rights sides together, matching seam lines, and Center Front and Center Back.
The battle is won, now we have to win the war!
Trim the seam allowances that were just sewn. Trim the facing seam allowance to 3/8", and the skirt seam allowance to 1/4" (no seam allowances will show through the skirt if you do this).
Yay! Step Four:
Press the seam allowances open, and then edge stitch the facing to it's seam allowance. Pictured below is showing the right side of the facing and skirt. Then press the facing inside the skirt, favoring the skirt edge by 1/8", so that you don't see the seam on the hem at all. You'll be left with a nice clean edge without stitching showing.
Last step! Step Five:
Use the blind stitch on your machine to secure the facing to the skirt. Pin this well before you stitch so that the blind stitch is parallel to the edge (very professional). You'll notice with hemming with a facing that you won't get any wrinkles in the hem, because a lot of skirt hem circumferences are either larger or smaller than the circumference of the hem point on the skirt. I'm telling you, making a hem facing is where it's at. Below is what the facing will look like on the inside once you're done.