I am tempted to post this without comment, but decided against it. This was my world as a young woman. Not just for secretaries, but for just about any woman seeking employment. The author, Ruth Millett, was not particularly conservative; she made her reputation early in her career as an advocate for working mothers during World War II. The advice she dispenses here was what we heard from our mothers, teachers, and mentors, because it was just the way things were.
I have no doubt that Hillary Clinton heard this advice at least as much as I did. Keep this in mind the next time you hear someone complain about "her voice, her clothes, her smile".