Elizabeth O'Connell used the girl's underwear as evidence in her closing statement.
This prompted Irish MP Ruth Coppinger to show blue lacy underwear in the Dáil (Irish parliament) and share a powerful message to her colleagues. That the complainant was "open to meeting someone" because she was "wearing a thong with a lace front".
"The women of this country are getting a little tired at the routine victim-blaming going on in Irish courts, and the failure of lawmakers in this House to do anything about it", said Coppinger, who illustrated her point by holding up a black thong.
In the trial, the defence lawyer told the jury: "You have to look at the way she was dressed".More news: Libya could hold elections next spring: Italy's foreign minister
The accused told his senior counsel that what happened was consensual.
News of O'Connell's remarks spread like wildfire on social media and gave birth to the hashtag #ThisIsNotConsent, which is being shared with photos of women's underwear.
Demonstrations will be held across the country today after a barrister defending a man accused of rape appealed to the jury to consider "the way [the woman] was dressed".
The controversy surrounding the trial was reminiscent of an outcry over intimate details made public in the trial of two high-profile rugby players, who were cleared of rape in Northern Ireland earlier this year.More news: Black Ops 4 Zombies Leak From Sacked Treyarch Employee Includes Secrets
Meanwhile, a series of protests are to take place tomorrow over the barrister's controversial comments.
Today's protest organised by ROSA Cork saw some 400 people march from Patrick Street to the Anglesea Street Court Complex, where dozens of thongs were hung from railings and laid on the courthouse steps.
In the capital, supporters gathered at the Spire of Dublin, where a "washing line" strung between lampposts displayed women's underwear.
Protests are to be held in Galway, Limerick, Dublin, Belfast and Cork throughout the week due to the support for the social media campaign.More news: Judge tells all sides of Florida recount to 'ramp down rhetoric'