In Seasonal Color Analysis, there are three sub-seasons within each of the four seasons. The True seasons are just that — true warm or true cool colors, but the surrounding sub-seasons serve as transitions into the neighboring season. For instance, the Light Spring palette would contain light, warm colors with a bit of cool tones mixed in from Summer.
You can also see in the image below that on opposite sides of the wheel we have Light and Dark (self-explanatory), as well as Bright and Soft. Bright and Soft define the contrast within the palette; Brights will be high-contrast, while Softs will be low-contrast.
The undertones of your skin, the contrasts in your features, as well as eye color will all play a role in your seasonal color.
While your natural hair color will enhance your features, it plays a secondary role in determining which season and sub-season you are (so if your hair is currently colored, we will still be able to do an accurate analysis).
I use draping scarves to determine color seasons. I have found this to be the most accurate way to really see which colors bring out your features.