Check the jeans first for the stretch kind and throw them out. I have done a lot of cutting before realizing that they were stretch. You dont want to have to deal with that when sewing. Aovid the front panel knees because even if they are not showing wear, they are most likely stretched out. If you need more, try going to a thrift/resale shop and ask for any that can't be sold. I have gotten many pairs that had one leg ripped while the other was good, or the hems ruined but the rest were fine. Also, if you have some left, two legs and a waistband make a great bag.