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MLB said it would consider appropriate actions if the guidelines were broken.

“It can be a fine line. What one person views as appropriate may not be seen the same way by someone else,” Courtney said.

At 81, former Marlins manager Jack McKeon has seen dress codes change a lot during more than a half-century in the game. Especially at warm-weather ballparks during the hottest summer months.

“I remember the old days, when even the people in Triple-A would wear a coat and tie,” he said. “Now, it’s casual. Less than casual, really.

“Today, it can look pretty sloppy. But that’s not just baseball. It’s generational.”