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 (ยฃ254) 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.