To make a ruffle, you need at least twice that amount to allow for the ruffle. I didn't have 72inches of fabric so I cut 4 strips of the fabric I used. Four strips of 19inches by 3.5 inches. Then the second ruffle was four strips of 19inches by 2.5 inches.
(4 and then the next 4) and pressed down the seams.
Next, to make the ruffle, you want your machine on the longest stitch length and a higher tension (this makes it ruffle automatically)
Start sewing on the non hemmed side to start the ruffle.
Now, you want to make sure that the ruffle length is the same as the skirt bottom. You will have to tighten and pull the thread to make it work. Then you want to pin both ruffles to your skirt (this is what takes some time) You pin them right sides together and upside down, with the shorter ruffle against the skirt...does that make sense?
Next, sew it on!!
Then flip it over, the right way, press it down and then sew a top stitch over the ruffles. This isn't necessary but it looks nicer and flattens out the ruffles a bit :)
ET VOILA!! You are finished!