I have got such a cloth, I forgot when I download or what it call, and make it for eve following morph worlds tutorial, then I conform it to the eve figure. It was ok when there were no bending or twisting. But when I bend the abdomen of the eve, the cloth becomes like this, the distort occur. But I found that the distort was not always happen, it occur when bend around 7-10, 20 and the render here is at bend 26, I found it also does not distort at 30, any one tell me what happen and what I need to do ?

o.... the picture is here..