dressing alike signifies unity, but usually at the expense of the individual. being a "copycat" used to be the worst style insult when i was a kid, yet being "unique" or "individual" were attributes hardly well-regarded by a pubescent peer group. you can't win.
trends drive all fashion business. even the right to mass individual style, credited to patricia fields, is a trend. i used to guard my fashion choices with pride and conviction, as if my whole identity were at stake. it wasn't just the clothing that i chose, and the act of choosing them, but the maintaining of the style as personal property that was important and tied up with who i was. that's sort of silly.
if it could be done, with enough choices for all, would you prefer a world where there were no repeats among individuals? where every person's style was original and unique?