A mayor in the US state of Louisiana says he will sign into law a proposal to make wearing saggy trousers an act of indecent exposure.

Delcambre town council unanimously passed the ordinance earlier this week making it a crime to wear trousers that show underwear.

"If you expose your private parts, you'll get a fine" of US$500 (£254) Mayor Carol Broussard said.

Offenders will also risk up to six months in jail.

Speaking of people who wear saggy trousers, Mr Broussard told the Associated Press news agency: "They're better off taking the pants off and just wearing a dress."

Town attorney Ted Ayo said the ordinance expands on the existing state indecent exposure law by adding underwear to the list of forbidden exposures.

"This is a new ordinance that deals specifically with sagging pants," Mr Ayo said. "It's about showing off your underwear in public."

Some residents say the ordinance targets blacks, as low-slung trousers are fashionable among hip hop fans.

Mr Broussard denied it was racially motivated.

"White people wear sagging pants, too," he said.