Paul Lukas on X: Cubs' blue alternate jersey includes National League logo sleeve patch. Only MLB jersey to include a league logo. Been there since 1997. / X

Major League Baseball - Wikipedia

Know your NLCS visuals — Chicago Cubs edition

Uni Watch's Friday Flashback - Baseball turns ahead the clock in 1999 - ESPN

The Coolest Throwback Jersey to Own for Each MLB Team, News, Scores, Highlights, Stats, and Rumors

Uni Watch - The best throwback uniform for each MLB team - ESPN

Uni Watch: Cubs uni history - ESPN Page 2

Paul Lukas on X: MLB logo was added to back of jerseys in 2000. Has different visual feel depending on whether jersey is plain, pinstriped, or has piping. / X

Uni Watch's Friday Flashback -- Where did the vests go? - ESPN

The Coolest Throwback Jersey to Own for Each MLB Team, News, Scores, Highlights, Stats, and Rumors

A Look at Jersey Designs That Lean to One Side

Gross: MLB Reveals Full Slate of Nike-fied Home Jerseys