Source: 49ers to introduce new alternate uniform for 2018 - Niners Nation
With other teams getting alternates, here's some possible choices for the niners via @thegraphicgod and @mcmanusdesign on instagram : r/49ers
San Francisco 49ers Get New All-Black Alternate Uniforms - WearTesters
San Francisco 49ers uniforms: 1994 red throwback jersey announced
The 49ers Should Wear the 1994 Throwback Uniforms As Alternates
Update] The #49ers will wear 1994 red throwbacks for four home games next season, and white throwbacks for two road games. The NFL usually allows teams to wear alternate uniforms twice per
George Kittle San Francisco 49ers #85 Youth 8-20 Home Alternate Player Jersey (George Kittle San Francisco 49ers Home Red, 4-5) : Sports & Outdoors
Browns unveil white alternate throwback helmets
49ers to wear throwback unforms against Seahawks
49ers: Ranking best jerseys and uniforms in team history
49ers Introduce New Throwback Alternate
San Francisco 49ers Officially Unveil Home Version Of 1994 Throwback Uniforms – SportsLogos.Net News
49ers New Alternate Uniforms - 2015 Nfl football 49ers, 49ers, San francisco 49ers