Lead singer Tom Meighan sported the red top for the band's encore at the Paris Olympia, to a mixed reception from the audience.
There were boos as Meighan strutted on for the encore wearing the new shirt - a classic red design.
But there were also cheers, and not just from the vocal Leicestershire contingent welcoming their heroes back to Europe after touring Australia.
The band, who have long professed their love for Leicester City, were delighted to represent England.
"It was a true honour to unveil the kit. It's amazing, it's like a shield. Because it is fitted, it feels like armour, made up of three different parts," Meighan said in The Sun.
"[Fabio] Capello even had a word on the design. He wanted it to be smart. That's how football jerseys should be."
The shirt will be available to buy next month.
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