Blue replaced brown on Padres uniforms in 1991, by FriarWire
San Diego Padres - Wikipedia
The Padres change uniforms, again, so let's look at their visual history
The Padres' Journey From Unique to Undistinguished (and Back Again?)
Padres uniforms: San Diego returns to brown jerseys in 2020 - Sports Illustrated
San Diego Padres - Wikipedia