2nd Century roman Tunic help

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Hey there So I have made a few tunics so far but they have all been plain either red or white. My question is what were the rules on having stripes on your tunic. I know that purple was reserved for Equestrian class (early period) and senators. But what about other colors? Did normal citizens put random colored stripes on their tunics or was that not allowed.

Please excuse me if this has been answered before but I couldnt find it. Feel free to move my post if its in the wrong area as well. thanks