The summer holidays are upon us, which means you're expected to be beach or poolside for at least a few days over the next couple of months, and you need something to wear. But there's something about moving from hotel room to deck chair, from beach umbrella to bar, or decking to disco that is sartorially tricky. Clothing that's easy to remove over your swimwear can feel a little casual, while dressing up too much to be near sand is just too fussy.