Pirates' 1970s mid-season uniform switch - old cap and/or helmet
Pittsburgh Penguins - Wikipedia
Uni Watch's Friday Flashback: Buzz, buzz go the Pirates - ABC News
Pirates Made Uniform History – FOB Sports (Friends of Bob)
Ranking all 32 NFL uniforms for 2017 from worst to first
Bringing it back: Pirates show off throwback uniforms
The best and worst uniform looks for every NFL team
Every new college football uniform for 2013: The master collection
Houston Astros uniforms through history
Stars and Strikes: Baseball and America in the Bicentennial Summer
The Curious Case of Oddities in Cardinals Uniform History - Viva
The Coolest Throwback Jersey to Own for Each MLB Team
How the Pittsburgh Pirates sparked a uniform revolution in the