Torontogirl, and Angie, Suz, the Cat, Katerina, I think you nailed it - thank you very much! Style consistency can be thought of as adapting outfits to different dress codes while keeping in mind one's style moniker and descriptors.
It may also be a matter of balance and/or emphasis between the different facets of the style moniker and the different descriptor. E.g. my moniker is "GI Princess", and maybe the "Princess" part would be more prominent for dressier occasions, while the "GI" part would be more prominent for casual situations. Both could be balanced for in-between situations.
As Rachylou illustrated it, putting such a theory into practice may be hard if situations and descriptors do not really go well together.
And as Cardiff girl made me realise, there's also another axis to be taken into account : style consistency across moods.
Kathie, Brooklyn, good point : weekend activities and weather constraints may definitely impact outfit options and require style compromises.
Greyscale, your observation on foundation cut changes is very interesting.
ChrisM, you illustrated so well the ultimate goal of all those thoughts : feeling at ease and "oneself" (is that even a proper English wording?) in all situations. Definitely not easy to achieve.
Mainelady, efbgen, Shevia, thank you for your very useful experience on overlap (items, fabrics, cuts, ...) between occasion capsules.