Queen Meve of Rivia from Thronebreaker and the later Witcher novels is depicted like this in CDPR, with golden armor. It does not appear that any of her knights wear gold armor either. Various English kings wore golden armor suits as well, historically:
In the books, Geralt stumbles into an ongoing battle that has nothing to do with him and is forced to fight on accident. After the battle he ends up getting knighted by Meve for his 'achievements' as Geralt of Rivia. The Thronebreaker cutscene shows Geralt smirking at Meve while she knights him. Then he deserts her army just like in the books. I just finished Book 1 a second time again and Sapkowski writes of Geralt's contempt for knights, similar in his mind as mafia enforcers with the feudal system as a criminal organization.
The first time I saw this character trait is at the very beginning of Witcher 3 in White Orchard where Geralt meets the Nilfgaard Officer pretending to show concern for the peasants.