I don't think I've ever used a ladder stitch before. Learn new things every day :) A fantastic tutorial for how to sew openings closed by hand using a ladder stitch. Pictures to guide you through every step!
Use this for all of the jeans that wear out in the crotch. I love so many of my jeans and I'm frugal so I hate throwing them away! Adventures in Dressmaking: Essential blue jean mending method--Tutorial!