The Giants wore their classic 1980s uniforms Sunday to honor one of their golden eras. Their current defense, however, is nothing close to it.

Instead, they spiraled into a new month with the familiar issues of not stopping the run or explosive plays. It led to a 34-24 loss to the 49ers, whose loud fans made MetLife Stadium feel like a home game for the visitors.

A week after Saquon Barkley torched the Giants’ defense , Christian McCaffrey took his turn. He had 106 rushing yards, a team-high 67 receiving yards and two touchdowns.

Brian Robinson Jr. added 53 yards on five carries, with three of his runs at least 10 yards. The Giants gave up six runs of at least 10 yards on their way to a third straight loss.

“The defense gotta be better,” linebacker Kayvon Thibodeaux said. “Front se

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