Chantal went 'commando' that evening
As confirmed in the first scene of the movie when Gene Hackman enters his wife's dressing room to see if she's ready to go to the fund raiser, we see clearly actress Monica Bellucci's beautiful tail...unadorned and pantiless... as she struggles with the zipper of her black dress.
Chantal's biscuit is "unrestrained" through the whole movie ! Outstanding ! And bold !
CmdrCody