okay, I admit I still have t resolve this, but from previous experiments I've found the following.

1. make the dress dynamic, and the belt just a collision target. Make the belt wide for a start, and then shrink it gradually in an animation. This is about the only way to keep the dress between the body and the belt. As in normal life: dress / shirt / pants first and then tightening the belt.

2. pay attention on offset etc. The dress needs no be some distance from the body as well as some distance from the belt, otherwise the sim might go nuts.

3. pay attention to the belt. Usually people make it a single sided object with no thickness of its own, and that't not going will in the sim. Make it a real 3D thing, with a thicksness which does exceeds the colision depth.

Technote: the sim takes a vert from the dress and keeps it some distance from the surface of the collision target. But in doing so, it does not have preferences which side of that target. So when the target comes close, the vert may jump to the other side of the target (and stay there). This is what makes your dress fall over the belt every time.

Giving the belt some thickness, and giving it some distance to the dress, does the trick. You must prevent the vert from making it to the outer side of the belt, then the sim will keep it at the inner side. In an animation you can first reduce the belt width, and then its thickness, to see where things go wrong.

have fun, and please give us your experiences in this.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

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