Tunic with two vertical stripes?

[Nathan Ross]

purple being reserved for the upper echelons of military and society.

I think there was a debate about this recently (on fb, possibly), and Graham Sumner mentioned finds from Egypt of tunic fragments from a military context (1st-2nd c?) with purple clavi - this might suggest that purple (or shades of purple) could be worn by the 'lower echelons' too.

As for tunics in general, wall paintings from Pompeii (AD79) show clavi on tunics, including fullery workers and people at a dinner party - so they were worn quite widely across society. Most appear to be dark reddish on white, although that could be because they show up better - this painting shows (very narrow) clavi on both yellow and red tunics.

I don't know if the ordinary clavii meant anything in particular - perhaps just a fashion thing?