Arsenal's No More Red campaign, launched in January 2022 in collaboration with Adidas, is a proactive initiative aimed at combating knife crime and youth violence in London.

By donning an all-white kit, departing from their traditional red and white, the club seeks to raise awareness and inspire action against these pressing societal issues.

When Did Arsenal Start Wearing All-White Shirt?
Arsenal debuted the All White shirt in an Emirates FA Cup round three meeting with Nottingham Forest in January 2022, where Mikel Arteta's charge suffered a 1-0 defeat to a late goal from substitute Lewis Grabban.

Since then, it has become a tradition, and the Gunners have done it once every year for their first Emirates FA Cup engagements.

Why Arsenal Wear All White Shirt?

https://www.betrekatips.com/blog/why-arsenal-wear-all-white-no-more-red/