Pirates' alternate uniform harkens to early '70s

Nick Dombkowski, West Springfield native, eager to begin pro career with Pittsburgh Pirates, 'I still have a lot to prove'

Rewriting Yankees history: the 1970s - Pinstripe Alley

Pirates Made Uniform History – FOB Sports (Friends of Bob)

LA Dodger Uniform History - How it all started and a Surprise Ugly Edition

Stronger Together: The Connor Joe Story, by Colorado Rockies

Some MLB uniforms if teams used the colours from their city flag like the Pirates : r/baseball

How the Pittsburgh Pirates sparked a uniform revolution in the 1970s - ESPN

Uni Watch's Friday Flashback -- The Pirates go back to their bumblebee days - ESPN

Third jersey - Wikipedia

What If? A Baseball Alternate Reality