I actually purchased several pairs of leg warmers to wear on my good leg after winter surgery in my left foot.  I knew that the large post-op dressing and subsequent cast would make it impossible to wear my normal winter slacks.  I was able to wear a leg warmer on my good leg along with a skirt or yoga length pants and feel nice and toasty.  The leg warmers don't slide down when I walk, and they wash nicely.  There are such a nice variety of colors.  I recommend them for any use to keep your legs warm.