Roman Tunic - Help

[Decebalus]

[u]The togas are plain white but I thought they had clavi along one edge too (???)

As a Senator or Magistrate you would have the right to wear a broad purple stripe on your toga (toga praetexta).
On Republican togas it would be sewn only on the rounded part (sinus), sewn because it is not possible to dye a rounded edge equally.
In the early Imperial period the stripe would be also on the even side (balteus).
To portray a senator you should also pocess a pair of calcei senatorii, the high boots of the senatorial order and a gold ring on the ring finger of the left hand.