Why NFL throwback uniforms might not return until 2023 under new helmet policy plus Steelers make surprise cut
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
Predicting what games 49ers wear their classic throwback uniforms
Utah Football Reveals New Hand-Painted Helmets, Throwback Uniforms
NFL allows teams to wear throwback jerseys for three games in 2018, per report - Acme Packing Company
After 9-year pause, alternate helmets returning to NFL in 2022
Is there a reason why, in American football, players are only allowed to wear their team's colors (i.e., no stripes or patterned shirts)? - Quora
Steelers to wear throwback uniforms vs. Raiders
Packers introduce history-inspired alternate uniform
Football to Wear Special Gold Jerseys for 50th Anniversary Game - Towson University Athletics
Tracking all the new NFL uniforms and helmets for the 2022 season - ESPN