The Violetta gown from Senzafine has a Victorian feel, especially when worn with the optional bustle (with attached flexi panels; a combination that works nicely together with mesh). It comes in three HUD-driven colour packs, all along a quite dark, suitably gothic range.
The gorgeous Carissa hair from Calico looks particularly fitting in this pale, winter-white tone, giving it the appearance of a baroque wig.
About as over-the-top as the hair is the Gloriah Crown from the Plastik for The Secret Affair. It comes in a wide selection of colour choices (this one is called Maria) and each colour includes six versions of the halo. I love the ethereal feel of this creation.
The Maleficium rings in red and green are by Bliensen + MaiTai and provide a nice touch of colour.
The poses used are both by Black Tulip and from their Lost in the Woods sets for the World Goth Fair and the pale skin is Neve by Tuli in t0.