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.
Only for ceremonies. Purple costs a snail snot ton of money.
Not Caesar though.
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.