In all the books there are descriptions of the various styles of togae, this one for a triumph, this one for a senator, this one for a boy who had not achieved majority and so on. Yet, these apply specifically to the city of Rome and generally there is very little discussion of the provinces. It is my general assumption that a provincial or Roman citizen on his way to the local forum in say Lugdunum to transact business would wear a toga but what about Roman magistrates dispensing justice in the provinces? The two examples that come into my head are Pontius Pilate judging Jesus and Verres during his false accusation that slaves were going to run off and join the rebellion. Would such men have worn togas while dispensing justice?
The toga was the ubiquitous and universal clothing of the Roman citizen in public. While a Roman citizen would frequently dispense with his stuffy and uncomfortable toga in private or when among friends in a non-official environment, one was expected without exception to be wearing a toga while conducting public business. The primary form of public business was magisterial duties--governors served in promagisterial functions, so during legal or other public duties they would be wearing a toga. Indeed, the toga was associated with magisterial power more than anything else, being derived from an Etruscan garment that appears to have indicated official rank from some very early date