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!
Dress shirt skirt OR Cut out the neck of a tshirt/sweater (unless you're a skinny-mini), pull it up like a skirt and tie the arms of the sweatshirt in the front. T-shirt sew, or don't sew short sleeves and tuck in to use as pockets.