On one of the lists I belong to the perennial topic of what to wear - if anything at all - has begun again.
Someone has highly recommended a 'foot glove' with plastic soles.
Personally I wouldn't want footwear with plastic soles because the way I treadle is to slide my feet along the treadle and plastic would not allow a 'slide'. Of course if I had back hinged treadles, sliding would not be an option, so once again what is 'efficient' depends - on the type of loom (front or rear hinged treadles) and one's personal treadling style. :}
My personal favourite - ballet slippers. They have a sturdy leather sole to protect my feet against the sharp edges of the treadles and give a little support, but are flexible enough that I can feel each treadle. They fit tight to the foot so my size XX's take up as little space as possible. :^)
I've also tried Dearforms, but in the end go back to my trusty ballet slippers.
Cheers,
Laura
the treadling video clip is now on my website - click on Videos http://laurafry.com