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It's difficult to mirror shades with greens, but most greens find a way to agree with one another. By matching greens with yellow or blue tones, it's easier to find an analog.
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Neutrals are faultless, in every way. They are easy to match, easy to wear, easy to find. Ease can be relevant, too.
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When layering the same color with neutrals, varying the shading can create a more dynamic look.