The Satin Spider 1986 L'araignée de satin

The setting is Les Fauvettes School for Girls just after WWI, where sternly Teutonic headmistress Ingrid Caven vies with Catherine Jourdan, a morphine addicted, fabric fetishist gym teacher, for the sexual favours of liquid eyed nymphet Scyluna. Meanwhile the chaplain conducts a nude exorcism.