In which case, I should start with the oldest - Cordelia's Winterfair gown. I have very little to go on (and thus can do pretty much anything I want). It's green, the long skirts are 'swirling' and there's a long, white, velvet vest that goes with it.
So. 'Swirling' skirt. I am thinking of going Victorian, but that wouldn't fit the 'Russian' feel of Barrayar. On the other hand, I can find Victorian patterns and pictures of the last Tsar and his family have a decidedly Victorian look to them.
What about this: http://trulyvictorian.com/catalog/297.html - the made-up pictures seem rather less full than the line drawing, though.
This http://trulyvictorian.com/catalog/296.html seems fuller and more what I was thinking of.
For a shirt: http://trulyvictorian.com/catalog/491.html It's pretty basic, but as I plan to put something over it....
I love the look of the Eton jackets: http://trulyvictorian.com/catalog/498.html
But there's the Ripple Jackets, too: http://trulyvictorian.com/catalog/496.html
As for the vest... I am having trouble picturing it, really. This is actually a belt and rather older in style http://trulyvictorian.com/catalog/445.html but still tempting. Vests do go UNDER jackets, after all, right? ;p