Alessandro Dell’Acqua is settling in at his No. 21 label and the strong collection he showed — only his fourth — made that point quite nicely. Dell’Acqua, who is best known for his ultrafeminine designs, was inspired by Milanese women of the Sixties — “very bourgeois but with a touch of eccentricity,” he said before the show. He injected the collection with a touch of masculinity, and more separates for day, including a madras shirt and trousers combination with embellished collar touches and light blue Oxford shirts with a utilitarian feel. It wasn’t all mannish, though. Dell’Acqua balanced the collection with feminine lace dresses and silk lounge pajamas in an abstract animal print.