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Default clothes don't work quite the same as regular clothes. The ones that only change the mesh and recolor usually have just those resources. The ones that completely change the outfit, maybe add groups and such to the mesh/textures, may have a PropertySet file.
You can extract the orginal PropertySet for the replacement you're working on (from the ingame files), add it to the file, and change it however you like. Just make sure you don't already have any mods that also change categories for the same piece of clothing.