A Central California school district settled a free speech lawsuit brought by a high school junior who was sent home for refusing to change out of a T-shirt that said, "Nobody Knows I'm a Lesbian."

The deal approved Tuesday night requires the Manteca Unified School District, which serves the cities of Stockton, Lathrop and Manteca, to adopt a policy clarifying that students may wear clothing with statements celebrating their or their classmates' cultural identities, according to the American Civil Liberties Union.

The case is the latest in a long line of legal disputes over the clothing messages that school and college officials may prohibit for the stated purpose of maintaining discipline.

Taylor Victor, 16, and her mother sued two Sierra High School administrators who told the girl in August that her shirt was an improper display of sexuality that violated the school's dress code and might be disruptive. A teacher had her called to the office when she showed up in the shirt, according to court documents.

"The law on this is very clear: Public schools can't censor the personal beliefs of students," ACLU attorney Linnea Nelson said. "The message of Taylor's T-shirt expresses the most fundamental type of speech already protected by the First Amendment, the California Constitution and the California education code."

Under the terms of the settlement, school administrators deny violating Victor's free speech rights and they and the district deny any wrongdoing. The school board approved the required dress code updates Tuesday night, spokeswoman Victoria Brunn said.

"Students continue to be supported in their right for self-expression in all of our high schools," Brunn said in a statement. "Our No.1 priority continues to be the ability to keep our kids safe physically and emotionally."

Victor, who was open at school about identifying as a lesbian, said she had reviewed the district's dress code before deciding to wear the shirt. Not finding any rules prohibiting pro-gay messages, she says she chose to go home instead of change.

"I knew that rule did not exist, and I knew that was my free speech right to wear that shirt to school," Victor said in an interview.

Victor has published a blog post for the ACLU of Northern California titled, "I Sued My High School for Censorship and Won."

A high school senior in South Carolina was suspended in September for also refusing to change out of a T-shirt with the same phrase as Victor's. The school district ended up overturning the punishment, saying the shirt bothered some adults but wasn't a problem for other students.

In other recent cases, Ohio University last year agreed to revise its student conduct code and pay $32,000 to a student who sued after a campus group was told not to wear T-shirts bearing a sexually suggestive double entendre.

In 2013, a Connecticut school district agreed to let a high school student wear a T-shirt with a slash mark through a gay pride rainbow after facing the threat of legal action from the ACLU.

But federal courts have allowed some limits on student speech.

The U.S. Supreme Court ruled in 2007 that an Alaska school acted within its discretion to discourage illegal drug use when it suspended a student who displayed a banner saying "Bong Hits 4 Jesus" at an Olympic torch relay.

And the 9th U.S. Circuit Court of Appeals said in 2014 that administrators at a Northern California high school plagued by racial strife lawfully banned T-shirts bearing the American flag while the campus commemorated "Mexican Heritage Day."

With the Central California settlement in the works last week, Victor was given the go-ahead to wear the disputed T-shirt.

"I wore the shirt on the first day I was allowed to," she said. "My mom bought me the same shirt in a different color, and she bought me a sweat shirt that says 'Dare to be Different' in rainbow colors."