At THE SAINT LAURENT fashion show in February models paraded in le naked dress: folds of transparent organza, tulle or chiffon, draped over bare breasts. At September’s event the most arresting devotee of the look was not on the catwalk but in the front row. Aged 61, Philippine Leroy-Beaulieu, the French star of the Netflix hit “Emily in Paris”, bared all through a translucent midnight-blue gown. It showed, said critics, that even in France you can be sexy at 60.