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Not ALL the object "backgrounds" are grayscale. Some of the T-shirts have colored single, logo images that aren't affected by CaST (though you can change the background color). Some of the furniture also has pre-applied color images, e.g. the floral ornaments on the cheap country furniture set. And of course there are paintings and posters.
So I assume that what we will need to modify those kinds of things, or make new ones, is a reskinning tool. That should also allow for setting up a graphic precisely positioned on a dress like the OP is talking about.
But that's gonna be a completely different kind of tool than what we have now, which will involve solving a whole different set of technical problems. At least, that's what I've been able to gather