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The CAS Unitool allows you to export and then replace everything except the bump-maps.
Start a new file in CASPart, select what you want to work on and then hit the Extract Textures button. This will give you the files to work on.
To identify which is which, click on Add New Design and then select the Other Details tab.
The extracted filenames will match up to the keys displayed for each part of your outfit.
When you have edited your files you can Replace them in the design by clicking the Replace buttons and Committing. Any file you have left alone can be left as the original in CASPart Editor.
Just be aware of the files which have an alpha channel and must be saved as DXT5 and those which don't and can be saved as DXT1.
HTH