I have to admit... I can see where dynamics would be vastly preferred for this item, and where it would benefit greatly from it.
But that said... primarily because I am a DS user... I probably would not download it if it's dynamic, because of the multitude of extra steps, OBJ exporting my posed Dawn along with anything else the cloth might collide with in a scene, then doing the import to Poser just to run the cloth sim, then another obj export back out again... and if I end up having to change Dawn's pose later on in the scene, which I do a lot, I have to do the process all over again...
I love the look of dynamics, but they are just too much time, too many workarounds and too much fiddling for me personally to have the patience to use. If DS could use Poser dynamics, that would be a very different story, but we are stuck with the Optitex stuff.
If you do this as a dynamic item, I think it will be gorgeous... but I personally would probably drool at it and then pass it up due to the dynamics.
But... it is your item. And I know as a DS-only user that I am probably somewhat in a minority around here. So do it in the way you want it done. I think it would be gorgeous either way, though.