Last autumn, when I went to a conference organized by the research project "Fashioning the early modern" (of which I'm not a part) in Stockholm, I heard Johannes Pietsch från the Bayerisches Nationalmuseum present a paper about the type of dress that we call a "robe à la Polonaise" and why this probably wasn't the correct period term. Ever since that I've felt that I really ought to summarize what he said and share it, but now I don't have to, becuase you can read his paper over at the "Fashioning the early modern" website: Naming a Woman’s Gown dating to about 1775 – 85.