@ FVerbaas, thank you for your response.Your solution sounds like something I saw in an very old dynamic cloth for V3.
The fellow who created it (SVDL is the name of the items folder) made 16 items to chose from, each with a different amount of buttons open or closed.

My initial idea using a script was to have those constrained groups saved to the library, like poses or props, it but seems not possible.
I went back to Blender and made separate material groups for each button to address them as individual constrained.
That made the selection part easier, but I couldn't figure out how to have more then one constrained group at a time and I didn't see how I can save them.
So, it seems that I have to go back to Blender and detach each button and save each step as a morph.
Your last hint means also I have to add a morph before the clothing item gets clothifyed, do I understand that right?
This was very helpful, thank you very much.