That’s what I’ve been thinking but kinda differently.
There are 2 parts of tznius. The actual halacha which is elbows, knees, collarbone. And then there is the image – the refined dignified look. So when people just say something is assur like sequins becuase on one person it wasn’t tznius, thats a problem.
As long as you are maintaining the right look within the framework of halacha (which is elbows, knees, collarbone) then its fine.
(And this goes with everything else as well. Everyone just immediately assurs everything cuz people can do bad stuff with it.)