The Gerry Anderson TV series UFO featured a group of officers who manned the deep space radar systems.
They were all young and female. They wore identical costumes and distinctive makeup and had purple hair that was styled in the exact same way. (See picture below).
The effort seemed to have been taken to make them seem unique or mysterious, and they were set apart from the other female characters who dressed normally and had normal mannerisms.
In-universe, were these characters supposed to be ordinary human beings, merely dressed up in an unusual way for some reason (if so, what?), or were they supposed to be something else, such as robots, aliens, or clones?
Is this ever discussed in the series, such as there being an origin or spotlight episode for them, or in any official sources such as a guidebook or novelization?