When I feel overwhelmed or that something is beyond my skill, I reach out to those who understand it better. I've talked to a lot of people about a lot of different costumes ! I start researching, and sometimes it takes months
Depending on how historically accurate you want to be, you could even start with one of the "Big Names" Civil-War types patterns. They even have a "crinoline" that shape.
Truly Victorian tends to have easier to understand and better patterns : http://trulyvictorian.com/catalog/60cat.html
. And they have a better crinoline pattern that I would really recommend over one of the Big Names.
I don't know what your goals or budget is, but if I were making this for myself, I would expect the cost to exceed $1000, and there might be hours and hours of hand-embroidering/beading involved for whatever the little motifs on her dress are. You might be able to screen-print / stencil and glue, depending on what you're willing to go with.
I've already spent over $700 on my Oscar Wilde costume, and it only looks like this : http://upload.wikimedia.org/wikipedi...1896)_3bis.jpg
Really caring about historical costuming = money sink. I think that can be said for other really detailed and in-depth cosplays, too.
You NEED a good corset for this.
If you can find a way to cut costs depend on what you're willing to settle for. Are you willing to spend months looking for sale fabrics ? Are you willing to go with a cheaper fabric ? Do you care if it's completely inaccurate and photographs poorly ? Do you not care if the motifs are all that similar ?
To really do an accurate reproduction of this, discounting likely more expensive undergarments than I've accounted for, I would expect to spend around $800 on fabrics alone. You could knock it down to $500 and still have something pretty decent (a good quality on the transparent fabric will help cover up a cheaper body fabric). Not to mention, you're going to run up a pattern bill of $50+ if you can't draft it yourself.
I'd expect to pay over $100 for the wig, if not more. You might be able to make it yourself for less.
Not trying to scare you away from this. O.o;; But, just look at it - you're making what compares to a very fancy wedding dress today (in shape and amount of fabric), and have you seen the prices for those ?