Since your dress is form fitting, how about a cropped swing coat or sweater with 3/4 sleeve? Kind of like an A-line silouhette but cropped right above the hip.
Like this shape except w/ 3/4 or longe sleeves and in a darker color:
This next one is a cropped jacket. You can't see it but it's fitted at the top and A-lines towards the bottom:
Or you could do a 3/4 length sweater coat in this shape:
I'll be out tonight w/ some friends so I'll check in tomorrow if I miss your pics.