When I tried to attempt this project I decided to take it the easy way. I bought a crop-top to match the skirt. Then I bought a skirt to match the crop tops color too. Then at Micheals craft store I got this blue zigzag fabric and sewed it onto them skirt
Sewing Individual Rivalry: IT'S HERE! Great tutorial on a simple maxi skirt with exposed elastic waist. Also links up to a circle skirt tutorial for girls and women with good instructions on how to sew the elastic on.