Hi there!
Yeah, never meeting a games, witch would use symbiotic\living clothes as a game mechanics. And that's a shame, because this is such a great concept with lots and lots af potential..
Don't know if it's even real, but for quite a while, I have an idea to make a mature VN, where the whole plot would be built around the symbiotes. I guess, this would mostly looks like a some kind of survival horror in isolated town with a local symbiotic "apocalypse", where the MC would interact with more or less "corrupted" girls, maybe even maling a relationships with them. Here how they might looks like:
An actual concept one of the character: