Steampunk Victorian Fashion just add goggles, pocketwatch, chains, keys, etc.
It's always good to have some inspiration before tackling the more literary Halloween costumes: Faces of the Victorian Era
Once upon a ball. Romantic soft blue gown. The bodice skirt over the tulle tutu. Raindrops and Roses
Victorian Women (1837-1901) – Richard Jenkins Photography
What Princess Muriel would wear. More
It's just listed as 'Victorian Bustle' .. I would very much wear this :)
Mid 1880s from the John Bright Collection
"1878 - 1890 Victorian." This looks like a modern-day movie costume (for Anna Karenina maybe? Oogh, that train), and I think the date may be off, because the bustle looks like the earlier style. Again, not mourning, but close.
Classic Green and White Gothic Victorian Dress More