In-between-y weather confusing you? Make a lightweight denim coat a new-season priority – the perf portable throw-on for channelling casj-cool 70s vibes, your daytime and going out wardrobe is so ready. See how Paris Fashion Week designer Vanessa Seward owned it on the catwalks, Behati Prinsloo bossed hers, and the style to bag that blue-jean swish.