Color picker identifies colors similar to ones in your palette. Those will be the best colors to wear.
There are two methods that you can use:
Star rays on the outer ring - Star rays blend into the square swatch if the color captured by the camera is similar to one of the shades in your palette. This identifies a color that will look good on you.
Vertical color bars on the bottom - The bar’s height grows with the likeness between the captured color and the color in the palette. Many raised bars mean that the captured color is perfect for your color type.
The screenshot below illustrates both methods.