Ireland usually only wear green when playing international matches at 'Tier 1' level. (i.e. against England, Scotland, Wales, France, Italy, New Zealand, Australia, South Africa or Argentina). For other matches they play in blue. (USA is a 'Tier 2' country).
I’m relieved to be able to say that that is certainly not the case!
They had a new kit launch and the USA match was the occasion chosen to reveal the alternative blue shirts.
//Padraig Power, Commercial and Marketing Director at the IRFU, said: “As we enter this exciting season for Irish rugby, the IRFU is delighted to unveil the new Ireland Home and Alternate jerseys range in partnership with Canterbury.
"The kits will be worn across the Guinness Series this November and we look forward to seeing the team run out in it in Chicago and at the Aviva.”//