Haven't you notice even once that no matter how fabulous the dress someone is wearing, still it doesn't fit right? Something is really wrong that you begin to wonder what it is and then after a keen observation you suddenly realized the color of the dress that someone is wearing is quite unsuitable to her/his skin tone.
A lot of us sometimes is a victim of this, we set aside the importance of giving a consideration whether the color of our outfits matches our skin color. Perhaps, we failed to notice it because we are more focused on feeling comfortable with the clothes we wear and then we think that's more important.
But hey, would you feel comfortable still if you happen to know you have a poor color combination?
That's why it is highly recommended to be aware on what color of outfits best matches your skin tone.
So there, hope you got an idea.