Mets to wear first responder hats in-game on Saturday for anniversary of Sept. 11

MLB struck out not allowing hats

Mets-Yankees hold 9/11 ceremony honoring first responders

20th Anniversary of 9/11 Tribute Jerseys and Caps. : r/NewYorkMets

Yankees honor 9/11 with hats, 09/11/2020

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

MLB commemorates 9/11 anniversary with ballpark ceremonies

MLB denied Mets' request for 9/11 hats based on 'uniformity', says Torre : r/baseball

Mets Reveal Their Plans For 20th Anniversary Of 9/11 This Weekend - Sports Illustrated New York Mets News, Analysis and More

Mets, Yankees will remember Sept. 11 attacks before Saturday game

Mets, Yankees to wear first responder caps for 9/11 remembrance game vs. Yankees

Mets, Yankees wear NYPD, FDNY hats on 9/11/2020