I need to line my son's cable knit beanie. And, I have no idea where to start! Any ideas???
This should get you started. TechKnitter just recently did a bit about lining hats.
That looks like a lot of work, but what a great idea!
I should have added that if the full lining looks daunting, she also has a post about just doing a band around the bottom to prevent forehead itchiness.