When Port entered the AFL in 1997 they were prevented from using the prison bar jumper, which they wore in the SANFL, amid opposition from Collingwood who maintain the design is too similar to their own guernsey.
The Power have since consistently requested to wear the black-and-white striped heritage guernsey in showdowns, but were barred by the Magpies with former Collingwood president Eddie McGuire stridently opposed to it.
Port were permitted to wear the guernsey in round two, 2020 as part of their 150th anniversary but had several other requests to wear it knocked back, including in 2021 when players instead changed into the guernsey after a showdown win over Adelaide.
Collingwood's shift in attitude marks a thawing of relations under McGuire's successor Jeff Browne.
"While we own the stripes in the AFL competition, we acknowledge the history and origins of the Port Adelaide Football Club and their contribution to South Australian football over a long period of time," Browne said in a statement.
"As president of the club board and following ongoing discussions with Port Adelaide president David Koch, it is our view that we acknowledge the history of Port Adelaide prior to their entry into the AFL and support them to wear their 'prison bar' guernsey in their upcoming home showdown against the Crows in round three."
Port Adelaide counterpart Koch hailed the agreement as a win for Power fans and hoped to extend the agreement beyond 2023.
"If the last few years have taught us anything it is that the fans are central to our game," he said in a statement.Â
"Our fans have asked for this guernsey. They understand more than any the importance of heritage and tradition and we are delighted to able to wear this guernsey again for our people.
"Collingwood president Jeff Browne and chief executive Craig Kelly have been outstanding to deal with during these discussions.
"There is a genuine sense of goodwill from Collingwood and an understanding that heritage is important to all clubs, not least of all Port Adelaide. We thank them for their collegiate approach.
"We look forward to continuing our positive discussions with Collingwood in regards to wearing our black-and-white prison bar guernsey again next year and beyond."
Port Adelaide face Collingwood at the MCG in round two with the Power encouraging their fans to travel to the game while the clubs will organise buses for SA-based Port and Magpies supporters.
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