Fort Collins is being sued over its ban of women going topless in parks and other public places.

The Coloradoan reports reps from Free the Nipple filed a civil complaint in U.S. District Court in Denver on Tuesday, claiming Fort Collins' anti-topless ordinance is discriminatory and unconstitutional.

Plaintiffs Brittiany Hoagland and Samantha Six say the regulation is a violation of free speech and equal protection in that it treats women and girls differently than men and boys.

"It's a petty and sexist ordinance that shouldn't have gone this far in the first place," said Hoagland, whose campaign against the ban was unsuccessful last year. If successful this year, she says the lawsuit could set precedent "for the whole of Colorado," pointing out that cities like Denver and Boulder currently do not prohibit women from showing their breasts.

Hoagland and Six's complaint is also asking for the City of Fort Collins to cover their court costs and attorneys' fees.

Right now, the law bans the exposure of the female breast "below the top of the nipple," but includes exceptions for breastfeeding women, medical emergencies, and places that nudity would be expected, like locker rooms.