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Baseball cap history and timeline
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Mike Piazza suggests 9/11 national remembrance
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SportsCenter - Both New York baseball teams, the New York
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MLB Players to Wear Ribbons on Caps for 9-11 – SportsLogos.Net News
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Best Mets and Yankees hats, jerseys, gear for the Subway Series
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Mets will wear special uniforms to mark 9/11 anniversary
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Mets, Braves wear caps to honor first responders
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Yankees, Mets get green light from MLB to wear first-responder caps on 9/11 anniversary
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Mets' John Franco continues to pay tribute to 9/11 first responders
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Yankees, Mets finally get to mark 9/11 anniversary with commemorative caps in-game
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Jonathan Villar #1 - Autographed Game Used First Responder Hat and Game Used White Commemorative Jersey with American Flag Patch - Mets vs. Yankees - 9/11/2021
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MLB finally gives Mets permission to wear NYPD, FDNY hats on anniversary of 9/11
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Dominic Smith #2 - Autographed Game Used First Responder Hat and Game Used White Commemorative Jersey with American Flag Patch - Mets vs. Yankees - 9/11/2021