The Fifties are back with a bang. The must-have skirt shape in this trend is the dirndl. But what is it? It falls below the knee, and it's full and flirty with a circular cut. This fun and flirty piece is perfect for every shape, because it minimises the waist, creating a feminine silhouette. Everyone from Dries Van Noten to Jil Sander sent these down the catwalk. Grown-up, playful, prim, sexy, retro-modern. . . this skirt has it all. It's a great wardrobe builder, because you can wear it with flats, smarten it up with a wedge, wear with a formal shirt to work or a simple vest on balmy summer days.