After the revolution in 1979, the Iranian Government passed a law requiring all women to cover their hair in public.
The law is enforced by the country's Gashte Ershad or "morality police" and punishments can include lashes and imprisonment.
But in recent years, Iranian women have begun using social media to protest the law and call for greater freedom.
In 2014, Iranian political journalist Masih Alinejad created a Facebook page asking women to share photos of themselves standing in public places with their hair completely exposed.
In an interview with Radio National last year, Ms Alinejad said the My Stealthy Freedom page was one of the only avenues through which women could speak out.
"In Iran there are millions of women who are forced to wear hijab, but the only way they can say no to compulsory hijab is through social media," she said.
"So that's why they send their pictures and their notes and express themselves, and show to the rest of the world that this is another face of Iran which you never see."
But in recent weeks, the campaign has changed tack, with men now posting photos of themselves wearing the hijab to show solidarity with the cause.
"I am wearing hijab only for a few moments to understand how my wife feels about having to wear it on a daily basis," one post reads.
"We are a father and a son. My heart aches for the injustice that my spouse, my mother, and my sisters have been suffering from," another says.
Ms Alinejad, who is now based in New York, told the ABC that women wanted men to understand how it felt to wear the headscarf.
"All our lives we've been forced to live like this. For so many men, I think it looks natural because they've gotten used to seeing us in compulsory hijab. But for us, for women, it is an insult when you force us to be something else," she said.
http://www.abc.net.au/news/2016-08-03/w ... aw/7677084
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