about dforce dress

You'll need to use the animation timeline for this. First make keyframes at 1 and let's say 15. Now make a primitive like a cube and position it at frame one where the part of the dress is that you want to hold between the fingers. Make sure the cube is intersecting with the dress so that part of the dress is inside it. At frame 15 move the cube to the fingers that are supposed to be holding the dress. Now run the dforce simulation with use animated timeline enabled. With any luck this should work.
If the cube moves but the dress doesn't follow, the cube may be too small or wasn't intersecting the dress enough. Try making it bigger. If it does work you might have to adjust the fingers a bit but AFAIK this method is currently the only way to do what you're asking. Hope it helps.

Also read this entire enormous tome of a thread: https://www.daz3d.com/forums/discussion/208141/how-to-use-dforce-creating-a-blanket-draping-clothes-on-furniture-and-much-more

It explains how to use primitives to act as guides much better then I can, plus there's tons of other useful info.