Nike are due to unveil England's top for the tournament on August 1, however leaked reports have claimed the strip will imitate the famed New Zealand shirt.
Ancient Maori symbols and decorations are also set to feature on the England jersey, with Key less than impressed with the design.
"I think it's a bunch of wannabes actually, there's only one team that wears black with pride and that's the All Blacks," he told 3news.co.nz.
Despite a number of complaints in New Zealand, NZRU chief executive Martin Sneddon has claimed England were granted permission on condition that they did not wear the strip if they played against the All Blacks.
"The All Blacks should take it as a compliment to them, ourselves, as a country believe in the power of the jersey, the power of the black, and maybe that is what England is trying to get their hands on," Sneddon said.
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