Mets will wear special uniforms to mark 9/11 anniversary

Yankees, Mets finally get to mark 9/11 anniversary with commemorative caps in-game

Mets, Yankees, MLB to Mark 9/11 20th Anniversary with On-Uniform Tributes – SportsLogos.Net News

Mets, MLB agree team will wear first-responder caps only before game to honor 9/11 - Newsday

Francisco Lindor's moving tribute to New York's brave first responders resonates with fans: Class act and shows respect

Ranking the current alternate uniforms of every NFL team

LEADING OFF: Mets host Yankees on 20th anniversary of 9/11

Sports World Remembers, Honors 9/11 Anniversary With Tributes – NBC New York

The Miracle Has Landed: The Amazin' Story of How the 1969 Mets Shocked the World: 9781970159097: Silverman, Matthew, Heaphy, Leslie, Goldfarb, Irv, Vorperian, John, Hoyt, Edward, Krieger, Tara, Simon, Mark, Silverman

Jacob deGrom #48 - Autographed Team Issued First Responder Hat and Team Issued White Commemorative Jersey with American Flag Patch - Mets vs. Yankees - 9/11/2021

Mike Piazza recalls first Mets game in NYC after 9/11