Yahoo Sports
As the 2024 MLB All-Star Game began, the uniforms were once again a topic of criticism among fans and media. No one appears to be a fan of the generic American and National League uniforms that players and coaches are wearing for the Midsummer Classic.
Besides the clunky logos on the front of the jerseys, the jerseys and pants being the same color (beige for the AL, black for the NL) resembles pajamas or softball league fits to many fans. It works for white and gray with home and road uniforms, but not so much with other colors.
MLB commissioner Rob Manfred even addressed the topic earlier Tuesday, saying that changes might be made for the 2025 All-Star Game. He also said he prefers the All-Star jerseys, rather than players wearing the uniforms of their respective teams.
SNIP
MLB went with the AL and NL uniforms as part of its deal with Nike and Fanatics in 2019, according to Shaikin. In an attempt to attract young and new fans, MLB asked its partners for suggestions, and league uniforms for the All-Star Game was one of them. The league reportedly did not consult with players before making the change, which was implemented in 2021.
https://sports.yahoo.com/mlb-all-star-uniforms-draw-ridicule-including-from-bryce-harper-rob-manfred-suggests-changes-will-be-made-004509259.html
Design uniforms to "attract young fans."