The idea behind the entire game is to allow experimentations between different forms and try out how different forms change how scenes play out. The new system for clothes are just a way to swap between different stats with more ease and allow for more experimentation. There are still plans to add more scenes and events that will interact with the different forms and the clothes you can wear. To give you more options to experiment with.
Also, the idea of simply making clothes set up tags when being worn is an idea that crossed my mind when setting them up, but it caused issues in other areas like the confused state or the transformation descriptions which would actually lead to MORE work than what I ended up going with.
Lastly, in your first paragraph, are you describing a bug that permanently give you a stat buff, even when your not wearing the right piece of clothing? It's just a bit hard to tell from the way you worded it. If so, which pieces of clothing does that problem occur on. Because I'll be sure to fix it.