A monsoon-like downpour fell on a steamy London as Erdem Moralioglu was shooting his resort collection on Guinevere van Seenus in his studio last week. Just the weather for looking at one of his great raincoats, then: a half-houndstooth Linton tweed, half-waterproof cinched trench. It’s a variation on the rainwear he had going a few seasons ago, now back by popular demand, and calculated to be delivered “at that time when fall’s just about to come—but you’re not ready for it yet.”