The only thing I remember from that book was never wear brown. It had been awhile since I wore my brown leisure suit anyways so I gave it to goodwill. In my 33 years working around NASA I never owned brown dress clothes and probably only saw one or two people in a brown suit.
Yes, the rule is if you work in a formal environment or "want to be taken seriously" wear black or navy and ALWAYS black shoes. Gotta go dark.
....but, rules ARE MADE TO BE BROKEN!!!! Aren't they? Come on guys!