Caught up to Bob Rafelson's dark comedy STAY HUNGRY, which most know as being the first serious acting role for Arnold Schwarzeneggar (who is really great in it, by the way). The main character however is Jeff Bridges, playing a ne'er-do-well trust fund kid who is charged with buying out a local gym for redevelopment but instead finds real friendship among its denizens, including Schwarzeneggar and his girlfriend played by Sally Field, who ends up having a fling with him.
In one scene, in his lavishly adorned house, they're playing dress up with the formal clothes left behind, and pass by a dressmaker's mannequin in a similarly lavish outfit. When Bridges walks into the living room, Field is standing still, posing like the dress form. Scene's not on YouTube but I did find a still.
