World War II is well-worn territory for prestige TV, but at first blush, “The New Look” has a novel way in. The Apple TV+ drama, created by Todd A. Kessler of “Bloodline,” traces the conflict’s impact on the Paris-based fashion industry, focusing on two titans of the craft: Christian Dior (Ben Mendelsohn) and Coco Chanel (Juliette Binoche), both founders of legendary houses that persist to this day. For the purposes of “The New Look,” which begins with the French capital under Nazi occupation, these peers are also foils. Dior is a sensitive dreamer whose younger sister, Catherine (Maisie Williams), joined...