Bare naked feet for me. I use either foot to press the pedal. Depends on where the furbabies are sleeping at my feet. :) I have a pair of thin soled slippers(like ballet slippers) I keep in my sewing bag for classes. I set up my machine then take my shoes off and put my slippers on.
I am adding to the question, do you only sew with one foot or can/do you use both feet?