Demna Gvasalia’s provocative work for Balenciaga rubbed many the wrong way. But he could offer struggling Gucci a jolt of the rude energy it needs.

J.P. Morgan analysts called Demna's appointment a "controversial choice," citing early feedback on social media and fashion blogs and a "question mark" now hanging over the brand's creative future.

Valentino, under Alessandro Michele, continues to delight. While the new Valentino is vastly different, Michele continues to ...