I almost missed this post. My bad. I did check this one, but unfortunately it only has two states, mask on or mask off. I think TN only made options to be in a binary state of all optional items on or all optional items off. If we had a situation of 3 states: Default, and 1) (A: on, B: off) and 2) (A: off, B: on) we could make multiple option sets, but costumes only seem to have 1 optional item at most all items meeting that criteria toggle at the same time.
Ah, I did look at the costume, that will take some work to make it optional. Hiding it permanently would be easier. Optional items require their own 'group' That costume only has 2 relevant groups. 1 for the costume 2 for the metal skeleton things. Hiding either group would result in removing key costume pieces, so hiding the mask piece only is the only simple workaround.
The Nyotengu hair thing was only occurring with the Hot Summer costume I was testing, so I don't know if something was cached with the DLC or what.
I know some costumes have their own hair object, but for those that don't the static 'item falls off' property would have to be in the costume somewhere. Eh well, I'll table that concept for a later time since there's already a lot to look into the possible restructuring for customp's and stuff.
I think I knew that lnk_reshuffle & archivarius can find that stuff, I just wasn't sure if it was easy to identify which one were the effect files and if any of the texture editors were able to be change those files as easily.