Do you want to stand out in a crowd of people dressed in black? Wear white.
Contrast can make an impact.
Strong contrasts make things stand out, they are noticed immediately, commanding your attention. A strong contrast will intensify the impact cf the contrasting items. What this brings to my mind is an image of a elderly woman with bright dyed red hair pulled into two pigtails, one on either side of her head.This all goes to show how memorable contrasts can be.