I’m not much of a whistler. I’d rather show you an old Serge Marck freebie from the now-defunct PoserFashion, “dynamified” for DS =D Obviously, an animated drape is required because the item has no rigging.
I noticed a few quirks in that sometimes the dynamified prop seems to become “dynamically frozen” in the sense that wherever it is moved, it jumps to a fixed point when draping, a point which seems to correspond to the initial position of the “dynamified” prop. But it doesn’t happen all the time (actually kinda rarely).
All the tricks still apply to these “home-made” dynamics – say, it’s nice to subdivide the item beforehand, and then apply a smoothing modifier to the finished drape (there is one in this render).