I think a lot of people who struggle with this are a neutral of some description.
The general idea is as follows-
High contrast between skin and hair but cool - true winter
High contrast between skin and hair but warm- true autumn
Low contrast between skin and hair but cool- true summer
Low contrast between skin and hair but warm- true spring.
A lot of people who are this obvious know their season.
If you are more neutral then you are looking at-
Dark autumn ( between autumn and winter but warmer than cool and needing dark colours)
Dark winter (between autumn and winter but predominantly cool- also needing deep colours)
Soft autumn( between summer and autumn but more warm than cool - needs muted tones)
Soft summer ( between autumn and summer - a tad warm and needing muted colours)
Clear Spring (spring with an element of winter. Can pull off black. Needs highly saturated warm colours)
Clear winter ( a tiny bit of warmth from Spring -really bright colours. Doesn't do well in icy colours - needs highly saturated colours)
Light Summer ( between Spring and summer so although predominantly cool colours they are brighter due to Spring influence.)
Light Spring ( between Spring and summer - so a slight coolness but overall warm and light in colouring)
It does get even more nuanced than this. If none of the above are obvious than you may have to refine a palette even more so that it is the best fit. One example of this is the soft summer deep category. These people are darker than the typical soft summers but winter colours are too much (Katie Holmes is often cited as an example of this colouring).
I personally don't think you need to be draped to work this out. Most people are aware of some colours that work for them and the addition of a palette of compatible colours helps them to expand upon this. There are some make or break colour guides online so it makes it easy if your are struggling. I think if you have a clear idea as to what your worst colours are then it's easier.
The Enchanted- glad you feel that one works 