Recently, I re-watched "UFO". The craziest thing was that the "Moonbase" ladies only wore that hair on duty. Off duty they actually changed wigs. So the purple bit was apparently, some sort of regulation. The things you don't notice at 16 years of age.
Anyway, fun work; I guess it's true futuristic girls somehow love this hairdo. Then again, it does look practical, and a more stylish alternative to going bald