Instead of thinking about investment dressing, Marina Moscone wants you to consider treasure dressing. That is, buying clothes that are well-made and practical, but also have a sense of wonder and whimsy about them—a special detail that elevates, say, your most-worn blazer to a blazer you couldn’t bear to part with. Fittingly, Moscone’s muse for pre-fall is a sea nymph who’s been hunting for treasure. But before you jump to Ariel and her thingamabobs, the clothes in this collection are more sophisticated and cerebral than the Disney princess. Moscone is generally known as a purist who favors silhouettes that hang away from the body, creating a tension between the masculine…