A lady in my ward brought one of these home from the store so we could figure out how to make them. Here's what we came up with. I don't profess to be good at giving detailed instructions. Let me know if you have questions.
You will need:
6 ruffles: top row: 4.5" x WOF
row 2-6: (1.5)- 4.5" x WOF strips each
waistband: (2) 4.5" x WOF strips
back: 14" x 39" muslin
1- Since you will need 1.5 strips for rows 2-6 of the ruffles, you will begin by sewing these strips together to make one long strip. Roll hem all strips on all 4 sides.
2- To gather your ruffles, use a basting stitch on the largest length possible at the top of each strip.
Leave extra thread on the ends. Pull on of the threads and "ruffle" your fabric.
3- Next, take your muslin and roll hem all but the top side. Mark on your fabric with a pencil how far apart you want your ruffles.
4- Starting at the bottom, lay your ruffle along the pre-marked line and sew to the back. Repeat for each row. You will need to gather the muslin for the top row since that row only has one WOF.
5- For the waistband, sew together your 2 WOF so it is one long strip. Fold right sides together and sew all sides except where you will insert your apron (about 29" in the center). Turn inside out and iron flat. Insert apron into opening of waistband, pin, and stitch shut (turning raw edges under).
You are done!
