What do the different colors of ancient roman robes mean?

The Romans wore a variety of colors and none of them had much meaning except the color purple. A young boy would have a purple stripe on his toga, before he received his "official" toga of manhood. A senator would have a broad purple stripe on his toga and sometimes his tunic, symbolizing his office. A triumphing general would be clad all in purple and it was a great honor if the senate allowed him to wear his purple robes for a public ceremony after his big day was over. The only other colors that symbolized anything else were the black or dark blue of mourning.