Get wardrobe count for whole account?
 

Brand new to modding,
after looking around in the API I found
C_TransmogCollection.GetCategoryTotal()
C_TransmogCollection.GetCategoryCollectedCount()

Which can get me the count for the current character, but is there anyway to get the count for the whole account? I figure worst case scenario I can just grab the data for other classes when they login, but that will include a lot of duplicates of items that multiple classes can use.

I know WoW has a count of these to track the fabulous achievement, but after the achievement, I guess there isn't a proper way to track this?

Unfortunately not. The API is limited to displaying what your current character can use.