Continue writing the next sentence.

How to make a ruffle skirt
Measure around your waist.
Wrap a tape measure around your waist, keeping the tape measure parallel to the floor and taut against your body. Mark down your waist measurement so that you'll be able to remember it more easily.
You should measure the area of your body where you want the skirt to sit. Your natural waist is usually a good choice if you aren't sure, but if you want the skirt to sit higher or lower, move the tape measure higher or lower accordingly.