![Signal Iduna Park Dortmund Germany, 5.11.2019, Football: UEFA Champions League Season 2019/20, matchday 4, Borussia Dortmund (BVB) vs Inter Milan (INT) 3:2: assistant referee in bright pink kit UEFA REGULATIONS PROHIBIT ANY Signal Iduna Park Dortmund Germany, 5.11.2019, Football: UEFA Champions League Season 2019/20, matchday 4, Borussia Dortmund (BVB) vs Inter Milan (INT) 3:2: assistant referee in bright pink kit UEFA REGULATIONS PROHIBIT ANY](https://c8.alamy.com/comp/2A9RM8G/signal-iduna-park-dortmund-germany-5112019-football-uefa-champions-league-season-201920-matchday-4-borussia-dortmund-bvb-vs-inter-milan-int-32-assistant-referee-in-bright-pink-kit-uefa-regulations-prohibit-any-use-of-photographs-as-image-sequences-andor-quasi-video-2A9RM8G.jpg)
Signal Iduna Park Dortmund Germany, 5.11.2019, Football: UEFA Champions League Season 2019/20, matchday 4, Borussia Dortmund (BVB) vs Inter Milan (INT) 3:2: assistant referee in bright pink kit UEFA REGULATIONS PROHIBIT ANY
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
![Referee Marco Guida during the UEFA Champions League Group B match at Tottenham Hotspur Stadium, London Stock Photo - Alamy Referee Marco Guida during the UEFA Champions League Group B match at Tottenham Hotspur Stadium, London Stock Photo - Alamy](https://c8.alamy.com/comp/2A5TX7H/referee-marco-guida-during-the-uefa-champions-league-group-b-match-at-tottenham-hotspur-stadium-london-2A5TX7H.jpg)