I went through a phase of making leggings last year and tried a couple of different tutorials but liked this one best. My Maddie loves leggings and wears very little else! She also loves to rake about so there are holes in pretty much every pair. I had no jersey knit so I decided to use a piece of fabric from a dress I had saved from one of her big sisters.
// I forgot to take a photo of this but lay your existing leggings on top of your fabric and cut around leaving 1 inch around the top and sides.
// Fold over the bottom edge twice and iron.
// Lay your 2 pieces of fabric right sides together and sew along the curved edges at the top.