As she held up the pair of underwear in the "incongruous setting" of the Dail, Coppinger asked: "How do you think a rape victim or a woman feels at the incongruous setting of her underwear being shown in the courts, and when is this Dail going to take serious action on the issue of sexual violence?"
"Does the evidence out rule the possibility that she was attracted to the defendant and was open to meeting someone and being with someone?" the defence lawyer asked.
Nearly 400 people rallied in Cork on Wednesday against the verdict, the Irish Independent reported, while the social media campaign #ThisisNotConsent gained traction globally.
The use of underwear as evidence sparked a backlash across the country.
He claimed the incident, which happened in a Cork alleyway, was consensual.
Irish MP Ruth Coppinger also hit out at the evidence produced by the barrister by holding up a lacy thong in parliament in a bid to emphasize what she branded the "routine victim-blaming" in rape prosecutions.
Dillon said the woman suggested a protest to highlight that what women wear does not constitute consent, and another woman came up with the hashtag wording.
Amid increasing media attention, Irish social media users expressed outrage at the remarks in court.
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.
Earlier this year, Dillon set up the "I Believe Her - Ireland" Twitter page with the aim of providing an anonymous and safe space for survivors of sexual violence to share their stories and to get support.
Protests have also been organised in Galway, Limerick, Dublin and Cork by feminist organisation Rosa.
Writing on Facebook, they called the reference to the underwear a "disgrace" and urged an end to "victim blaming in the courts".
Meanwhile, in the capital under the Spire of Dublin monument, a "washing line" of underwear was hung from one lamppost to the other.
In a tweet, Coppinger explained her point further - and put the word out for a lunchtime protest tomorrow (14 November): "I hear cameras cut away from me when I displayed this underwear in #Dáil".