A seminarian in Rome lives in a collegio. Before the broken 1960s most every national college in Rome had a uniform (some form of the cassock). Seminarians were always seen at least a group of two or more and always in their national version of the cassock. The Germans wore all red, the Americans blue buttons, red piping and white collar, etc.
The good news is that sometimes you still see these on the streets of Rome such as this guy who I think is from the Ethiopian College. It's fun for the guys themselves (a little team spirit), for the Romans and others, too. Pray for this return.