The Boston Red Sox were given the green light by MLB to wear

Members of Red Sox wear No. 21 with pride on Roberto Clemente Day - The Boston Globe

Ranking MLB's City Connect uniforms - ESPN

Unexplainable 'flashing' light disrupts Yankees-Red Sox game

MLB green lights Red Sox' yellow jerseys for playoffs

National Baseball Hall of Fame and Museum ⚾ on X: #OTD in 1942, President Franklin Roosevelt wrote what is now known as the Green Light Letter to MLB commissioner Kenesaw Mountain Landis

Why are the Red Sox wearing yellow and blue? Origins of uniform examined

Why Does the Army Wear Green? Its Symbolism and Significance - Kel-Lac Uniforms, Inc.

Fenway Park, Map, History, & Facts

The Official Site of Minor League Baseball

Ranking MLB's City Connect uniforms - ESPN

Why are the Red Sox wearing yellow and blue? Origins of uniform examined

Green Monster - Wikipedia