At least with a skirt, I have a general idea of how I would make it, but with socks for instance I think there would need to be some significant iterative development on design, fabric, and construction. So I was mighty happy when Becky picked up a big ball of black string and some darning needles and repaired like 5 pairs of nearly useless socks in my drawer. She has been darning over a tennis ball to support the surrounding fabric and shape her woven string in the darned area.
She also cannibalized the knit fabric from another garment to sew some patches on one of her last pairs of leggings, which had holes in the knees.
I have patched and sewn closed some holes in pants, as well as rehemmed a couple pairs, but I was not bold enough to take up true darning.