Tunic with two vertical stripes?

[Nathan Ross]

Even in the army?

Why not? Soldiers were very fashionable people!

The problem, of course, is that we don't know whether military fashion followed civilian fashion...

It does occur to me that there might have been a practical purpose to clavi, beyond just looking good - a traditional sleeveless Roman tunic was basically a big square (or broad rectangle) of wool or linen. Very easy, perhaps, when unfolding it and putting it on, to confuse the top and the sides; having clavi down the length of it might have acted as a handy 'this way up' marker... Anyone who's fussed about with putting a plain cover on a duvet may well understand this!