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
Sew top of jeans onto skirt material. I used an old pair of jeans & an old skirt. Its so much easier with an old skirt just make sure you get the hemline correct before you sew it together. (BW) perfect for those too short girls skirts too!