I do this. I have started to buy high quality wool socks, of a norwegian brand; Ulvang, wich last a long time, but earlyer I darned wool sock heels often.
It takes some practice to not make a Hot Spot on your heel when you do this.
I have also some heavily darned wool underwear, fortunately most people cannot see this.
And mittens. Fortunately my mother have knitted some pairs of wool mittens and "fingerlesses". She made shure I got some yarn in the same colour, too. She have seen many of my of-colour darning projects.
I simply hate to throw away clothes because they have a minor damage.
When appropiate I sew on patches on clothes, too.
It may be strange, but I sometimes repair my wifes clothing. She did not learn this from her mother.
timann