Have you considered Lucy? She has an amazing orange gown/nightgown in the Coppola movie.
If you're interested in any of the Coppola version movie costumes, by the way, the Holy Grail of reference pics is here:
If you're wanting to go an easier route for Mina Harker, there's the also recognizeable and less detailed version from League of Extraordinary Gentlemen. She has a couple of outfits: