This is a sewing optional project my sister and myself came up with and completed, in about 5 minutes. Sorry if the pics are bad..
1
Take an old pair of pants (preferably ones that aren't too tight at the ankle) and cut off the legs a little higher than you want the Legwarmers to come.
2
Flip them upside down so the rough hem(the one you just cut) is towards the ground. Try them on.
3
If they are too loose, you can add a thin piece of elastic to the tops and sew over it.
If they fit well,you can skip this step.
4
Last, you can hem the bottoms or just leave them alone, like we did.
You now have two legwarmers and some extra to make something else with. Enjoy!