Hi , I just received your message & replied it , but wait a second, I see something here in the screenshot you posted,, I want you to try something also beside the suggestion I gave to you in the message reply,,,,, I see you are using a dForce Companion, I want you to make all the Zipper Slider to be (Not Visible in Simulation) ,,, probably that is why the Jacket is Exploding, if you don't use the Companion tool ( the Zipper SLiders are automatically not affecting the simulation & it won't explode, if you wanna use the Companion, then uncheck all the Zipper Sliders, I mean make them not visible in dForce SImulation)