Red and Black are the colors of Baelzebub - Black for the eternity of darkness and red for the colors of hell. Thus the color symbolism of women wearing red is that of the Devil. Aka the original seducer (remember red and black are the colors of seduction)

Pink actually isn't particularly vivid its a hue (ie saturation level) of red. And it is particularly desaturated IE not vivid at all, so your "vividness" analogy goes out the window. In fact a saturated Yellow or Green are much much more vivid than pink.

Pink is pussy. And even in non-work settings, wearing pink does say "I am my pussy first and anything else second". Red is the color of active seduction, pink is the color of flirtation and an invitation ot romance - ie sex. But it is passive sex - of being penetrated.

And I know it sounds like I have pussy on the brain and sex on the brain. Its anything but. I actually find pink to largely be a turn-off precisely because it is so obvious, shallow and frankly boring.