I feel that, historically, this was supposed to be a method of keeping the bread in one's mouth for "high school girl with bread in mouth" cosplay. Then someone actually into BDSM saw it and realized what had been created. Or something.
I am now a die hard Glamor fan. That frame of her in the dress was enough to make my heart bleed. And watching her inner conflict over how she wants to act and how she wants to live up to her Father's expectations is just hnnnngh.