After last season’s Highland fling, Stefano Gabbana and Domenico Dolce returned to sea level with a spring D&G collection inspired by the French Riviera. They didn’t have any old beach bum in mind, though, rather a twenty-first-century version of Cary Grant in To Catch a Thief. The Grant élan could be felt in the tailoring—shawl-collared or peak-lapel suits in various combinations of navy and white—and in the polka dot neckerchiefs that were tied loosely under the jackets.