How did we ever get from underwear or lack of underwear to that of pedophilia?
I guess certain types of "underwear" that women wear are so skimpy that they cannot really be classified as underwear. Any law that would require underwear would certainly have to define "underwear" and like a member previously mentioned, there would have to be some kind of enforcement.
Enforcing said law would be the problem right there. Would women have to pass through a detector to see if there are metal hooks attaching the bra? Some bras do not use metal hooks but only elastic.