I know, I wasn't really talking about my game either, but this one primarily, and games generally.I wasn't talking about your or your game in particular just saying that its possible in general without increasing the file size by 100%
2D games can get away with that pretty nicely, but 3D games like this one (and mine), would really struggle to make it look good. About the only one who did that well was Love of Magic, but it is not as if you can't tell that they are layered in, but they animated them, and built it like a 2D game.
Point is, that it would really change the look of the game, and be a lot of work for Runey to implement, and seems unlikely.
Runey said that they will get the option at the end of each girl's story. That is really all that matters, I guess. lol