The Belgian took over from Hedi Slimane at the house in April.
Vaccarello sacrificed his own brand to take the job.
The show featured short leather mini skirts and dresses bearing breasts adorned with glittering nipple pasties.
The designer, though making his mark, paid homage to the house and its founder.
Jane Birkin and her daughters, sat in the front row beside Yves Saint Laurent’s partner Pierre Bergé.
Paris Fashion Week, which closes the season after New York, London and Milan runs until October 5. (Euronews)