This was the very first class project my class done in Home Ec. a hundred years ago.
It takes 2 yards of fabric, 1 piece of 1" wide elastic, enough to fit waist + 1", thread to match fabric. With wrong sides of fabric together, stitch together with 1/2 seam allowance, press seam open. Fold over 1/4" on each open end & stitch along the top. On one end fold over 1&1/2" to form a casing for elastic, starting at seam, stitch around the bottom of fold, leaving a 1" opening to insert elastic, I use a large safety pin to insert the elastic. Stitch ends of elastic together & distribute gathers evenly. Hem to desired length.
I hope this make enough sense that you can make a skirt.