T here’s a particular kind of optimism that comes with the first real day of summer sun; not the false start kind in April, all blue skies and betrayal, but when you can leave the house without a coat and not immediately regret your decision. In theory, the summer dress is the easiest item in your wardrobe to style. One decision, one zip (or none) and done. However, this ease can be deceptive. Without the option of layering, a summer dress has to be versatile. Natural fibres such as linen and cotton are a great place to start. They’re breathable, allowing for airflow on even the hottest days. High-quality pieces will not only feel good but also last for seasons to come. Silk or satin, while less practical on paper, can work when the cut does the heavy lifting: think relaxed silhouettes that allow the fabric to move, not cling. Whatever the occasion, the right dress can rise to it. From workdays to party wear and everything in between, here are some of the best summer dresses to wear this season.…