I was thinking about this the other day, not so much for capsules, but for proportions- just as you said, that tunic length tops go with leggings or slim leg pants.
So I added it to my spreadsheet; something else to play with
At this point it is just lists of each silhouette- leggings, slim leg pants, slouchy pants, hi low tops, tunic length, etc.
In practice, I am still working with my outfit project in which I select a number of pieces that I want to wear over the next 2-4 weeks. Then I choose a top or bottom to go with those pieces and those are the outfits i wear. I do have one section of my closet where I hang all of those together. The rest of my closet stays organized by category, by color.
I'm not as focused on mix and match, if I have a favorite way of wearing something, I will repeat it that same way.
The best benefit to me is having ready made outfits ready to go each morning. And if I put something on and don't love it together, the rest of my wardrobe is right there to swap with.