"We followed discussions on Twitter and elsewhere online and decided to take it one step further," says Embla Huld Þorleifsdottir a student at Kvennaskólinn.
Although the temperature was just above freezing she says they didn't feel cold at all. The sun came out during their walk which helped.
"The response was great. Women came to their windows and greeted us, one of them actually ran out and took off her top. Drivers slowed down and there were many who took pictures."
She adds that out of the lot only one person boo-ed the group of girls.
Þetta var bara að gerast! Áfram rokkuðu menntaskólapíur! #FreeTheNipplepic.twitter.com/ZJE2KOr4Ur
— Hildur Hjörvar (@hhjorvar) March 26, 2015
One of them is Björt Ólafsdóttir, a member of parliament for Björt framtíð, who posted a picture on Twitter with the message: "These are for feeding babies. Shove that up your patriarchy."
Þessi er hérna til að gefa börnum að borða. Troðiði því upp í feðraveldið á ykkur. #FreeTheNipplepic.twitter.com/4HmYzJO08k
— Björt Ólafsdóttir (@bjortolafs) March 25, 2015
Jóhanna María Sigmundsdóttir, the youngest member of parliament in Icelands history, also supports the campaign. On Twitter she asked when basic anatomy had become a sexual thing and something to hide.
Former Miss Iceland Manúela Ósk has also posted a picture of her nipple as well as Margrét Erla Maack, former media personality and circus performer.
#FreeTheNipple
pic.twitter.com/RrFh26WLBS
— Manuela Ósk (@manuelaosk) March 26, 2015
Þessi var tekin niður af instagram. #prudes#FreeTheNipplepic.twitter.com/c50t5lX8HE
— margrét erla maack (@mokkilitli) March 26, 2015