The Cubs City Connect jerseys are a tribute to all of Chicago's

City Connect - Wikipedia

Brewers unveil City Connect uniforms

Cubs unveil Wrigleyville City Connect uniforms

Why do the Red Sox wear yellow jerseys?

Chicago Cubs Reveal New 'Wrigleyville' Nike City Connect Uniforms – SportsLogos.Net News

WinS® Chicago Cubs City Connect - Konni Mackenzie Art Card Slab – S. Preston Art + Designs

Red Sox dump the red for yellow and sky blue in new alternate uniforms; White Sox, Cubs will have their own versions - Chicago Sun-Times

Chicago Cubs Reveal New 'Wrigleyville' Nike City Connect Uniforms – SportsLogos.Net News

Where to buy Nike City Connect jerseys: Chicago White Sox creates new MLB apparel