From Schiaparelli’s opening show, “The Abyss,” to Armani Privé’s boudoir-inspired collection, through Piccioli’s debut at Balenciaga and Blazy’s second collection at Chanel: what stands out from Paris Couture Week.

Since 1838, in Place Vendôme, it has dressed Proust and Churchill. Now, the historic Parisian shirtmaker is joining Chanel's orbit—and Matthieu Blazy has a hand in it.