Louisiana town to ban saggy pants

The town council of Delcambre voted unanimously to ban low-riding pants that reveal even a glimpse of *gasp* underwear. Said Delcambre Mayor Carol Broussard:

"If you expose your private parts, you'll get a fine of $500".

Leaving aside the hilarious prudishness of considering underwear as 'private parts', the new Delcambre law raises an issue that has long haunted me. Why do we consider underwear scandalous, while bathing suits are accepted in polite company? I mean, no reasonable person can believe there is a functional difference between a bra and a swimsuit top. To wit: if showing your underwear in Delcambre is now illegal, can you be hauled off to jail for wearing a board shorts? These are the kinds of things that keep me up at night.

I'm keeping my fingers crossed for a first-amendment challenge. At least then we can get some judicial oversight on the swimsuit/underwear conundrum.