Historically, this group has been required to wear distinctive clothing to indicate their race:

athletes

Gypsies

Jews

Germans

Historically, the Gypsies were required to wear distinctive clothing to indicate their race. The correct option among all the options that are given in the question is the second option. They are basically a nomadic group of people that originated in India and later in the 8th and 10th centuries CE, they moved to Europe.

I believe the answer is: Jews

This practice is widely used in the 13th century.

During this period, Jewish people wear cape with yellow ring decoration in order to distinguish people in their race with another. This tradition started to dissapear as we enter the 14th century.