Angusticlavia

[1] The angusticlavia was the tunic associated with the rank and office of the eques, or equestrians, one of the two highest legal orders in aristocratic Rome.

In ancient Rome, the color purple became increasingly linked to the higher classes, and eventually to the emperor and the empire's magistrates.

[4][5][6][7] On certain occasions, particularly during times of political or social upheaval, senators in Rome chose to wear the equestrian tunic as a public display of distress.

In 53 BCE, during a period of civic violence, the consuls put aside their senatorial dress (the laticlavus) and summoned the Senate in equestrian attire (the angusticlavia).

Wall paintings and other representations of the Roman past "show all types of men and boys wearing stripes of similar width – but there were later attempts to enforce or reintroduce the senatorial and equestrian classes".