I didn't know this how-to when i made these, but it's totally what i did, so it's even a version :)
I used child's pants, so that's why i can put them only under the knees.
We all know that the best part of a boot sock is the cute part that sticks out over your boot, so why waste time knitting the rest?
From old pants to Awesome Legwarmers and enough extra to make shorts or something
Upcycled Sweater Skirt and Legwarmers Tutorial
use tinsel eyelash yarn to give a festive stripe to these simple ribbed legwarmers