We had shot several days with Kate with her hair down. And the studio called and said “I don’t like the way she looks”. And that was how the ‘Janeway Bun’ came into being.
We had to go back and re-shoot major footage.
I can honestly say this is probably the only Star Trek pilot in which the hair dressing cost more than the special effects.

Micheal Piller - Executive Producer Star Trek Voyager