I just wanted to leave this here as an example of how this system could go. And keep the thread alive a little longer.
I stitched together the top from the Lizardly Costume onto the outfit my Character was wearing. This is how I'd best prefer my character to look, by just using the chest slot of the Costume instead of the entire thing. I mean, how gorgeous is that? I absolutely LOVE that top but I don't like the Costume's skirt nor sandals.
Being able to chop Costumes up into separate body slots would make Outfits even more appealing AND give us incentive again to continue buying Costumes as they're released. Not to mention this would only further the player's ability to create unique styles for their Characters.
I can see costumes like grahtroot climber outfit being very popular among the community who wants to mix and match skimpy clothing