What was recognized as formal wear for Roman citizen men?

The toga, a distinctive garment of ancient Rome, was a roughly semicircular cloth, between 12 and 20 feet (3.7 and 6.1 m) in length, draped over the shoulders and around the body. It was usually woven from white wool, and was worn over a tunic. In Roman historical tradition, it is said to have been the favored dress of Romulus, Rome's founder; it was also thought to have originally been worn by both sexes, and by the citizen-military.

As Roman women gradually adopted the stola, the toga was recognized as formal wear for Roman citizen men. Women engaged in prostitution might have provided the main exception to this rule.