Reinforce your Knitting

I came across this older post from the Yarn Harlot and was reminded how useful a crochet chain can be to reinforce knitting that is stretching too much in a specific place.  I find with my little ones the the back of cardigans (in between shoulder blades) often stretches, especially if they pull on the sleeves. I’ve tried out this technique and it was amazing!

Reinforcing Crochet Chain

Anyone else ever experience some unwanted stretch?  What do you use/do?