I am about a size medium. If you need to adjust the size of the pattern, here is what you need to know. You want your waistband a couple inches bigger than your waist so that you have room to get in. Each tier should be about 1.5 times wider than the one above it. You can also go a little longer with the skirt by increasing the 7 inch tiers to 8 or 9 inches. Just remember each inch you add on each tier adds 3 inches to the skirt length.
7"x60" tier 1
7"x90" (sew the 2 -45" strips to make one long strip) tier 2
7"x120" (sew the 2 - 60" strips to make one long strip) tier 3
Now that you have everything cut, here's where we start. Take your waistband piece, fold and press it down the center so that it is 2 1/2 inches now. Now you are going to take your 7"x60" strip and run it through your sewing machine with a gathering stitch about 1/8" from one side. Make sure to leave the ends long in case you need to pull out some of the tightness in your gathered stitch. This material is pretty thin, so you machine will gather it right up. Here is how mine came out.
Once you have the skirt back to right - side out, we are going to do a top stitch about 1/8 above your seam. You want to fold your seam up under it from the back. This will not only hold your seam up and keep it secure, but it makes the garment look a little less homemade and a little more store-bought. (Like the original one in the picture.
Once you add your second and third tiers, sew the two ends together to create your skirt. Here's what you have when you are done.
Decide how long you want your ties to be and sew the ends securely. The only thing left is to hem up your skirt. I did a double 1/4 inch roll up on the bottom.
Try on your skirt and make any adjustments you want at this point. I ended up needing to take in the sides about an inch on each side. No problem.