Goodgulf,
Thanks for the trip down memory lane with "Lady Jane." I was a very young girl when I first saw that movie, and while I already knew my secret spanking interests were powerful, this scene set them on overdrive.
Oh, Helena Bonham Carter! Oh, the severe-faced actress who played her birch-wielding mother! And the fact that there were not one, but TWO whippings!
You wrote that Jane was beaten over her dress. We didn't get to see the rear end in those scenes, of course. But the actions strongly implied the poor lass was birched on the bare.
Immediately prior to the punishment, the imperious mother dismissed the men from the room. As a viewer we didn't immediately know why, but then the mother took the birch in hand and ordered her daughter to bend over a stool. And THEN, unless I am hallucinating this, two maidservants stooped behind and lifted the girl's skirts.
We couldn't see from the viewpoint of the bircher, so the movie did not actually reveal any of Miss Bonham Carter's skin. It is only in my imagination that poor Jane has just been denuded. But that's how I remember it, and also how I fantasized placing myself into the scene as a very young spankophile.

Samantha