Blue replaced brown on Padres uniforms in 1991, by FriarWire
The Padres change uniforms, again, so let's look at their visual history
Padres uniform history: The 1970s - ESPN - SweetSpot- ESPN
Padres uniform history: The 1990s - ESPN - SweetSpot- ESPN
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Padres uniforms: Visual history of brown, yellow, blue, orange, sand - The San Diego Union-Tribune
Blue replaced brown on Padres uniforms in 1991, by FriarWire
Brown has been part of the Padres' history since expansion, by FriarWire
Order Restored to Uni-Verse as Padres Bring Back the Brown
Bring Back the Padres' Pinstripes
Padres Unveil New Uniforms With Brown-and-Gold Color Scheme - Sports Illustrated