There are two things that immediately come to mind when I think of this question. The first one is the way in which in some schools (I went to one) students have to wear uniforms that make them appear the same, and you are not allowed to choose your own clothing to wear to school. This of course means that you are not free to express yourself through your dress and ensures a basic sameness that permeates the entire school.
My second thought concerns cultures which stress the value of conformity and following the group over following your individual desires and wishes. A culture such as the collective culture of China, for example, places a high value on sameness and the importance of community, even if that means suppressing your own desires and wishes. Either of these could be used as a modern day parallel for this excellent short story that presents us with a world where political correctness has gone wild.