Mayor Pro Tem Dwaine Caraway said the fashion sends a "negative message." He said saggers now need to change their image more than ever.
"We now have a reason to really represent, when you look at our new president," Caraway said.
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Caraway's effort to create an anti-sagging ordinance last year was shot down by legal and constitutional concerns. But he said it's time to try a different approach.
"Obama would have never have ever had the chance to become president had he been sagging," Caraway said.
He is organizing a "Sagging Summit" in Dallas for everyone who sags their pants or supports the fashion statement.
One man who wears saggy pants said it's just "the style."
"I don't really care what people think," he said.
But some people say the style is offensive.
"Nobody wants to see your butt, and you don't want to see nobody else's butt," one former sagger said.
He said the fashion can also hurt people's job prospects.
"It definitely hurts their chances of getting a job, because we got something here in America called professionalism," he said. "You have to look professional."
The "Sagging Summit" begins at 9 a.m. on Saturday at Dallas City Hall.