ooooh thats lovely! im not great at this but id probably go silver. shoes like this and a bag like this although i think you could get nicer versions than that! The silvery pewtery shoes the model is wearing look nice. silver would pick up the silver piece on the dress. or maybe nude? its a lovely dress you don't want anything which is going to take away the attention from it. Hopefully someone who is good at this will come along soon!