Sewing pants for a kid? Save yourself some trouble in the long run, and just add knee patches from the get-go. Here's how to make patches that are built in!
Denim Repair: How to Patch Jeans With Holes
Awesome Knee Patch Tutorial — Willow and Stitch
Patching Knees With Your Sewing Machine
How to Mend: How to Sew Holes in Pants by Darning on a Sewing Machine
Simple Ways to Sew Patches on Jeans by Hand: 12 Steps
How to Patch Jeans With Iron-On Patches and Cool Appliques - FeltMagnet
How to Fix Ripped Jeans with Visible Mending // Sashiko and Denim Patches
How to: Add a Knee PATCH to Jeans, Hand Sewing Sashiko Embroidery
HOW TO FIX RIPPED JEANS - 5 EASY STEPS - PHOTO + VIDEO
4 Secrets to Patching Clothes, Living Well
Patchwork jeans : Easy DIY ideas - SewGuide
Todd Snyder on How to Add Patches to Your Jeans - The New York Times
PATCHED AND STACKED JEANS sewn patches on jeans and extended pants