Colors are categorized by Cool, Warm and Neutral.  

Cool colors generally look best on people with more pink/peach in their skin.

Warm colors generally look best on people who have more peach and/or olive in their skin.

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This is simply a guideline and not a 100% rule of cosmetics.  Some people are unicorns (we envy you) and can wear any color and look great in it.  For questions on understanding your tone, message me for help.