I can share some personal thoughts about porting clothes from Unique slaves to Regular ones. It all comes down to sprite atlas resolution. I'm currently target 2048x1024 for girls at maximum. That includes plans for porting all possible hair combinations. Clothes are harder to control in scenes and various states: tits size, pregnancy/fetus count, clipping with other body parts. And it also takes more atlas size naturally.
In my opinion we should concentrate on hair styles, horns, tails... maybe different designs arms and legs too, but implementing these might be questionable.
There's another reason why I don't like more clothes: Spine slot activation for clothes by default code goes with two conditions:
1. Room slaves currently located - remember maid clothes in WIP rooms? That's how it activates.
2. Workaround depending on selected body parts. I'm using pubic hair type to switch between various rag cloth sprites in V2P. It's just a workaround, though.
I think that is more productive to make girls to look different in naked form. Hairs do the trick quite well. Clothes? Not so much.
ElysiumEnd compatibility with TitsV2P won't be an issue for assets if we'll use same Spine projects. I guess at this point I can start to share these. I'm still pushing triangle and vertices count as much as it won't break animations for girl/woman skeletons. Mod merge under the name "overhaul" (Phantasy Overhaul) will be good, I don't mind it.