Source: 49ers to introduce new alternate uniform for 2018 - Niners Nation
49ers Unveil Alternate Throwback Uniforms at Annual State of the Franchise Event
49ers Throwback Inspired Alternate Uniforms
49ers First Alternate Uniform
49ers unveiling new alternate uniform
49ers Throwback Inspired Alternate Uniforms
Picking a jersey has uniform appeal among 49ers' players and fans
49ers team president: Throwback uniforms are coming
49ers Unveil Alternate Throwback Uniforms at Annual State of the Franchise Event
49ers First Alternate Uniform