I regularly patch clothes – mostly the knees of J’s jeans, and recently some of J’s socks. I do boro-style patches (like this but less polished) and other forms of visible mending. They never look super awesome, but they are durable. (I’m going to look like a hobo one day, though.)
If you aren’t sure how to repair an item, take a look at Make Do and Mend. It is a British WWII booklet on caring for and repairing clothing. It is super detailed! I’m sure everyone could learn a new technique from it.