I wish that catchphrase would just die! ARGH! lol! Fashion is about style, trends and fads essentially.
Every year 'colour189' is the new black. Then black is always back but the irony is that 'black' was never out and is always in, and nothing is really ever black if it isn't black. (I love stating the most obvious ) So just ignore people who like to insist on anything when it comes to what you feel you are comfortable wearing.
It's just what someone decides. A new Fall collection is launched with all beige-ish brown dresses and suits along with matching accessories...then Fashion house #6 has a similar colour scheme and it catches on.
Every colour has a shade or tint that can be worn by anyone. Black is not a colour so it is the staple and usually the safest of shades to wear, along with greys and navy blues.
Honestly, the colour never matters so long as you like it and when you hold it up to your skin, you still look healthy. If you are not familiar with how patterns work, stick to basic block colours or a fine vertical pin-stripes...Stay simple if you aren't sure. It always looks much more sophisticated anyhow.
It's best to make your own choice as to what's in and out I am still looking for a Cerulian Blue wool ruffled flare coat...sigh.