white jerseys, only orange. I guess they figured the orange was light enough that it could be used for both home and road uniforms. They also must've thought that orange on white numerals would not stand out enough to be easily readable, because when they did finally go to whites, they outlined the numerals in black, which was not in their traditional color scheme.
I believe UCLA did a similar thing in the mid sixties, wearing only a very pale powder blue for both home and road games.