Davide The easiest approach in your case is to export the skeleton three times, enabling the export flag only for the skin you want to export each time. This way, at runtime, your skeleton will require only the regions for the selected skin.
Thanks this seems to work!
Davide Next, use the texture packer separately, providing as input a folder containing only the attachments of that skin. For example, to create the atlas for skin1, if your image folder is structured as follows:...
I'm not sure why I need this? Doesn't the first part cover all my needs? Is this a different approach or an extension?