I saved bread bags all the time when we lived in Mass. — When the kids went out to play in the snow it went thus — long socks - bread bags - another pair of long socks - boots - snow pants — etc. — their feet/legs stayed nice and dry and you just peeled off the layers on the doorstep until you got to the bread bags and then dragged the kids inside :)
Firmly middle class upbringing in 1970s New Jersey, wearing bread bags on our feet, albeit only inside our boots. And it wasn't just my family, everyone did it.
You see, most of us middle class kids in my neighborhood were raised by parents who grew up in working class families during the depression and/or WWII and they were practical and no frills in many ways. If putting bread bags on your feet meant you could slip into boots that were a little snug so new ones weren't needed, perfect.
I suppose if I grew up with a silver spoon like Olberman I'd have never seen a bread bag, much less worn one.