In 1969 Romy Schneider and Alain Delon costarred alongside Jane Birkin and Maurice Ronet on "La Piscine", a film by Jacques Deray. Besides the intriguing plot, what was special about this film was the fact that Schneider & Delon were seen together on screen after having ended their relationship years before.
I suppose the photo below was taken during a promotional trip for the film. On it we can see Alain Delon wearing a black shirt, a leather jacket (ideal for this Fall/Winter), an original thick leather belt, and clear trousers. Romy Schneider is wearing probably a knee length dress with a waist belt, and a head band.