In any city, the clothing of people reflects their personality and also their lifestyle. In Ancient Rome the type of cloth and dress distinguished one class of people from another. Tunics and togas were common items of clothing. However, shepherds and slaves wore tunics made from coarse and dark materials, whereas the elite class of people wore tunics made from linen or white wool, and the super elite class of senators and magistrates would wear tunics with purple stripes.
To survive in Ancient Rome from a clothing sense, try not to wear tunics and togas made from coarse and dark materials as you will be perceived as a slave and not get the desired respect. If you wear clothes that make you look like a senator or magistrate, that will get you the respect from most people, but you could also become a target for thieves and vagrants. Wearing tunics made from linen or white wool will get you the respect, and will not make you stand out so as to attract the attention of unwanted characters.