Oh, I never meant to imply that many, or any, potters during the 60's would throw in a dress! I thought though, that the style of dress and her hair, etc., was sort of 60's looking. And to me, the dress was a give-away that maybe she wasn't a real potter, but just posing. I also noticed none of the other people in the photo were using this gizmo! As for people like Bernard Leach, I have no doubt there have been some potters who dressed quite well while throwing. I know a woman who would wear long sleeves buttoned down while teaching a throwing class and manage to get nothing on them! That just isn't me, or most of us, I'd imagine!
I'm straight out of the sixties and never threw in a dress.
Two very famous and much-loved potters, Nan and Jim McKinnell, were always well-dressed for the pottery classes they taught. Nan used silk handkerchiefs to wipe the clay off her fingers and Jim always wore a bow tie.
My Ceramics instructor in college, wore nice shoes, khaki pants, and a button up or polo shirt every day. He threw so fast, and with a minimal amount of water, he never got anything on him. Even with all the demos, and his own bit of work, that he would do, during the class, I never saw that he got anything on him, clay, glaze, etc.
In regards to the posted picture, that looks like something you'd use, if the clay body contained ground uranium......Hey, glow in the dark pots!!!