On console there doesn’t seem to be an ability to have them wear anything but the default rags.
It would be nice to have the option to uniform workbench thralls or give them attire that matches the race they are from.
A step beyond this would be having the ability to give workbench thralls different weapons for when they are attacked.
But for the moment I’d be happy if we just had the ability to give workbench thralls different attire.