The thing with clothes that do not cover properly is that they will end up biting you when bad weather comes around. We don't mind clothes making characters look seductive, so long as they make sense for a medieval society. Doesn't matter if you go for dress, tunic, pants, robes, etc... That can all depend on specific culture in one nation or other. The more balanced gender-wise a society is, the more likely it is for clothes to be practical for women too. 
We doubt women dress equally to men in the Dominion of Idris, for example. After all, they are hardly more than property there. If you're going for "femme fatale", we would guess a suit of say, form-fitting leather would portray the right image. It could also serve as partial armor as a bonus. (think a bit like the mord-sith from the sword of truth series) 
An easily discarded, thick woolen Cloak could add necessary protection from elements to such. Woolen lining (on the leather) might also be beneficial.