What insult did Caesar do that insulted the senators what excuse did he give what does plyutarch say about the excuse?

Julius Caesar insulted the senators by wearing a purple toga, which was a symbol of royalty and reserved for kings, during a public event. He justified this by claiming it was the traditional dress for the celebration of his victory over Pompey. Plutarch notes that this excuse was seen as a blatant affront to the senatorial class, as it undermined the Republican ideals of Rome and showcased Caesar's growing ambition and disregard for traditional republican values.