It's reasonable to assume that the characters are speaking their native language and it's being translated for our benefit, but it becomes weird when they use idioms or puns in English that don't exist in those languages.
He was wearing it all the time before he was assassinated as the senate had allowed him to do so. This was after the 5th triumph when they dumped a lot of other titles on him. The picture has the laurels in it, which is also typically just for ceremonies, so he should also be in a purple toga.
Is this a new thing that people include a CC anti AI license in their posts and comments? Would be pretty cool if it could be integrated in a smoother way as like a post property.