Help with legatus legionis impression

[Lucius Poblius]

Could anyone provide me with some information on what a legatus would wear when on a campaign, or point me to a source with some information?

I've seen a number of statues where they're wearing muscle cuirass, would this be accurate or is this simply propaganda? Would they wear a tunica with purple clavii or something different? Cacei?

I'm guessing a very elaborate sword and shield?

Many thanks!