Simply search for the best wedding guest dresses, and you'll be faced with an explosion of colour and an array of floral and chiffon, but a truly stylish outfit ignores the norm and stays true to its wearer's personal style. Don't underestimate the practicalities of breathable fabrics and colours that will keep you cool in the heat, and focus on accessories that will go the distance (flat sandals are an absolute yes if you're a guest at a beachy wedding abroad this summer, for example).