Who wore purple striped togas?

The toga with horizontal purple stripes was the trabea. There was a purple and saffron stripe trabea was worn by the augurs, the priests who performed augury (divination of the omens of the gods). There was a purple and white trabea which was a royal toga of the Latin kings and the kings of early Rome. Later it became the badge of the equite (equestrian, cavalryman) order, the lower tier of the aristocracy, because it worn by young equites in the parade of the transvectio equitum. There was also an all-purple trabea which was first worn by Julius Caesar and later by the emperors.

There was also the toga preatexta. It was off-white (the colour of undyed wool) but it had a purple border. It was worn by:

Freeborn children prior to puberty. Originally the right to war this toga was reserved to the sons of patricians. Then it was extended to all freeborn boys as a sign of 'free birth.' During the Second Punic War the right to war this toga was also extended to the sons of freedmen, provided that their mother was a patrician. It is known that girls also wore the toga preatexta, but it is uncertain whether they were given this right at the same time as boys or later. They wore it until they got married.

The two top magistrates (executive officers of state), the consuls and the praetor, the dictator (an extraordinary officer of state) and the aediles (junior magistrates). It is uncertain whether the other magistrates (censors and quaestors) and the plebeian tribunes also wore this toga.

Former magistrates who led posts entitled to the toga preatexta, but only for ceremonial occasions.

The senators on ceremonial occasions.

Some priests (e.g., the Flamen Dialis, the s quindecemviri sacris faciundis, the septemviri epulonum)

The magistri vicorum on the day of the religious festival of the compitalia, a festival of the wards of Rome. These magistri were selected from the common citizens of the ward to preside over this festival.

Magister Collegii, These were the presidents of a collegium or corporation.

There was also the toga pulla preatexta. The toga pulla was a black or grey toga which was worn for mourning. The pulla preatexta also had a purple border and was worn by the man who the last rites for the deceased. Usually this was a relative.