- Avoid colors on the exact opposite sides of the color wheel like red and green. If you change the hue of one of the colors it can be possible to pull it off though.
- The most popular theory for combining colors is called the rule of two-thirds. Make an equilateral triangle (a triangle with 3 equal sides) on the color wheel. In it’s most basic form, the points at the ends of this triangle will be touching either red-blue-yellow or orange-green-purple. From there, you pick two of the three colors that the triangle touches. These colors will almost always harmonize together beautifully.
This is an example of changing the hue so you don't end up with the horrible red & green combination. The yellow & green are similar in hue, but the pink blazer looks nice with it.
Orange and green are very close to each other, but the orange is a little darker and the blue is a little lighter.