Retail earnings season has been grim, with storied brands from Nike to Gucci-owner Kering reporting steep declines in sales. This week, perhaps we’ll see a change in the mood. An eclectic group of companies have managed to defy the gloom that’s settled in over much of the industry, several of which are set to report third-quarter results in the coming days. That includes a resurgent Adidas (results out Tuesday) and luxury stalwarts Prada…