Yes it is stunning. But I might pick out paler colours for shoes and bag, and hat if wearing one. The only hesitancy I have about it - because it's really beautiful - is the dark colour. You don't want to look too sombre.
I'd go for smoky lilac shoes that pick up the pale purplish mauve colour in the dress, and a minty sagey green for the bag, that links with that colour in the dress.