I just received my sale Backpacking Light vapor mitts a few days ago. After trying them on my hands I wondered if they would work as socks to keep my toes from freezing in my hammock at night.
My size large gloves fit my size 11(women's) feet just fine. I tuck the thumb in, the palm goes on the bottom, the wrist strap slips around to the palm side and grips the heel, and the gauntlet elastic cinches around the ankle.
Under the mitts I wear a Smart Wool liner sock, vapor barrier, and thick wool clean sleep sock. My toes have been toasty the last two nights in a hammock on my porch (low 18F). I'll very likely use them on my feet more than my hands.
Honest, I didn't read this thread until looking for a spot to post my idea.
Maybe the good folks at BPL could test them for durability as footwear and post a foot size chart for them;)