It's important for the top part of the skirt to be a generously measured because the gathering takes up fabric as seen in the gathering step. If you use fabric then just measure how long you want the skirt and sew it together at the sides and then follow the Gathering step.
here's the "pattern" i used. i tend to just cut...i really have no rhyme or reason to my shapes and patterns. this one happens to be 8" high. you will cut 2 with the interior fabric and 2 with the exterior fabric you then have the body of the purse..interior and exterior...and then you have 2 pieces to create the strap for your shoulder at the bottom of the picture. (Figure 3,4)
Now it's time to grab that other sock, provided it hasn't disappeared. Don't laugh -- I have about a half dozen socks whose partners have mysteriously vanished.