I am not a Victorian underwear person, but many of my friends are. Well, they're actually Victorian clothing people, but that includes underwear.
Okay, first--Doctor Who! Yay!
If you were dressing a human, I'd say this look requires a cage crinoline. However, dolls aren't assembled in quite the same manner as people. Dolls are also incapable of sitting in a way that will keep their undergarments properly arranged.
Before the invention of the cage crinoline, women would wear hundreds of petticoats to achieve the fashionably female bell shape. (fine. not hundreds. only a dozen.) I suspect this, combined with corsets, is what lead to the Fashionable Female Heroine of period novels swooning at the drop of a handkerchief. Cage crinolines only needed a single petticoat, worn to soften the lines of the cage. They also needed long drawers, because a good breeze could be very embarrassing.
What if you tried several petticoats? You could probably make a sort of modified, built in cage crinoline in the bottom layer. Make your boning channels reach waist to knee, and concentrate on boning the sides and back. That way her skirts might not poof up into her face when she's sitting. You could make the bones out of water or juice bottles so you'd have some natural curve.