Block's incisive yet graceful brushstrokes captured the most important styles of the post-war era, including collections by Norman Norell, Yves Saint Laurent, Pierre Cardin, Coco Chanel, James Galanos, Givenchy, Pauline Trigère, Bill Blass, Halston, and Geoffrey Beene.
In the May 2009 issue of Vogue, photographer Steven Meisel, who began his career as a fashion artist, recalled Block's composure: "He would sit there with this long cigarette holder and a polka-dot bow tie, always a sports jacket, immaculate.
Block was enthralled by the glamorous film stars of the era and by the great fashion artists then working for Vogue and Harper's Bazaar.
Concurrent with his editorial work, and for a dozen years after his career at Fairchild ended, Block created a prodigious portfolio of commercial fashion art, including drawings made during successive long-term contracts with three of New York's best-known specialty stores—Bonwit Teller, Bergdorf Goodman, and Lord & Taylor.
When Diana Vreeland joined the Metropolitan Museum of Art's Costume Institute, she immediately turned to Block to draw the poster for her first exhibit on Cristóbal Balenciaga.