The original tutorial is at the following link: Knit Skirt Tutorial
Just one thing: when you add the ruffles, be careful. When I went by the tutorial, I ended up with "wings" because the layers ended in points on the side. I had to go through and re-hem each side to make the ruffles rounded instead of pointed. It looked like I had 3 sets of wings without doing that!
I also used a heavier knit material than the tutorial writer did (apparently), since my skirt holds its form more than the one pictured on that blog did. That's OK, it actually fits my personality better.
Don't be afraid to try on the skirt before you add on the waistband/ruffles...I ended up taking mine in about 2 inches to get it to fit correctly! Remember that knits stretch, so unless the skirt you use to make your pattern is a stretchy skirt, you will most likely have to make this one smaller. Skirts that have zippers are a little wider than stretchy skirts, since they don't stretch over your body and conform to it. I used a zippered skirt for my pattern and didn't even think about that, thus creating more work for myself!