Wimbledon means adhering to a few rules (bare shoulders, jeans, short skirts and trainers are banned); equally, anything too dressy looks wrong at midday in midsummer. Potential rain showers and sudden sweat-inducing heat waves are also factors to consider.In the 1980s and ‘90s, Princess Diana and Princess Anne responded to this with lots of colourful linen skirt suits and pretty separates; thirty years on, and the dress undoubtedly reigns supreme.