So, some outfits are listed with the unlock requirement of "collect all pattern sets" in both Cher's guide and the JP wiki. Since there's no image of them in either, I guess those vague instructions came from the guidebook, but what does it actually mean? All sets from shops and the Fashion Fiesta? Every single pattern including those sold by Suzanne? Something else entirely??
Also, are those last outfits tradeable? I'm guessing not since some higher-level outfits aren't, but one can dream.