The Pirates are wearing some sweet alternate throwback uniforms this year - NBC Sports
MLB Jersey & Cap History
Kyle Schwarber homers, Bryce Harper ejected but Phillies fall to Pirates 3-2, Sports Ap
Pirates Made Uniform History – FOB Sports (Friends of Bob)
Pirates Made Uniform History – FOB Sports (Friends of Bob)
LA Dodger Uniform History - How it all started and a Surprise Ugly Edition
Pittsburgh Pirates Unveil New City Connect Uniform: Bleeding Black and Gold – SportsLogos.Net News
How the Pittsburgh Pirates sparked a uniform revolution in the 1970s - ESPN
Pirates Made Uniform History – FOB Sports (Friends of Bob)
Throwback Uniforms: Pirates and Reds (1979)
How the Pittsburgh Pirates sparked a uniform revolution in the 1970s - ESPN
Logos and uniforms of the New York Mets, New York Mets Wiki