I had a similar problem with a new clothing item I had created, a belt that kept growing horns during the sim. But I wrote it off eventually to the cloth touching the figure before the sim started, even though it didn't appear to be touching at all. It seems to be crucial that there be no contact between cloth and figure at the beginning of the simulation, or results are unpredictable (except to predict that they will be awful). I wonder if "touching" is an over-simplification of the condition that causes it. It makes more sense that you will have problems if the cloth is closer than the limits set for the simulation, regardless of any actual contact. I think that is what was happening with the belt. M