During the inaugural Geansai Nollaig Day in Dublin City Centre, 583 people donned their best festive jumpers - setting the new world record for the Largest gathering of Christmas jumper wearers / Most people wearing Christmas jumpers in one place.
The Guinness world record for the largest gathering of people dressed as snowmen was 333, in an event organised by Hope House Children's Hospices (UK) in Oswestry, Shropshire, UK.
Guinness World Records also recognized the world record for the most lights lit simultaneously on a Christmas tree: 194,672 - achieved by Kiwanis Malmedy / Haute Fagnes Belgium in Malmedy, Belgium.
Many opted for traditional woollen jumpers featuring snowmen and reindeer, while others were more adventurous with tinsel and glitter-glue, creating their own designs.
Geansaí Nollaig Day was set up by the Dublin City Business Improvement District to raise funds for children's charity, Barretstown, and to boost the Christmas mood in the capital.
BID chief executive Richard Guiney said he was delighted at the turnout.
"It's a great testament to the Irish sense of humour and also an excellent way to get people together and have fun," he said.