Not a specialist but I can try some answers: 1: no: you can have as many collision objects as you want and they don't need to be rigged object (like furnitures: chairs, ...). Yes: you can have only one clothe object by simulation but you can use the result of the first simulation as collision object for the next simulation 2: I pass! but you can show some samples 3: Rigidify "use vertices neighborhood" avoid the mesh to fall aparts, if you only use "by vertices extension" you may have problems