It doesn't take much to upset the wardrobe department at Wimbledon. This is as true today as it was in 1905, when American player May Sutton Bundy, competing in the final in a corset, a stiff petticoat and a floor-length dress, rolled back her sleeves because they were "too long and too hot" and promptly caused an outcry. One newspaper reported that the future King George V cried in the royal box. Let us hope that the tears were prompted by Bundy beating England's beloved Dorothea Chambers to the title rather than by her sartorial misdemeanour.If the All England Club dress code remains gruelling for players, it has relaxed for spectators. Technically, "torn jeans, running vests, dirty trainers and sports shorts" are the only items verboten for debenture holders with seats on - and lounge access at - Centre Court. Everyone else can wear whatever the hell they like. But, in reality, everyone, particularly at Centre Court, is notably smart. It's a dress code that can only be described as Wimbledonian. So what is that?The Duchess of Cambridge invariably wears white to Wimbledon. In 2012 she could have doubled for a particularly dazzling ball girl in a preppy, cable-knit Alexander McQueen dress; last year she rolled out her tennis whites again in a broderie anglaise Zimmerman number.If you like lace but can't afford Chanel couture, opt for it in cream - cheap white lace always looks cheap. The key is in the accessorising: never wear a white dress in the presence of a fake tan, peep-toe platforms or a Formula One driver boyfriend. You are aiming for a modern update on Julie Christie in Far From The Madding Crowd , not a baby Kardashian.If white feels like an unforced error, a summer dress should still be your first port of call. Victoria Beckham looked all wrong in 2013 wearing a black lacy Louis Vuitton slip dress. The general rules are: not too short, not too tight. Fortuitously, mid-length dresses are the very thing this season, and in floaty fabrics they'll lend themselves to the promised heat wave and look a little less contrived than a pleated cousin.A sparkly necklace can brighten up a dull neckline if you're worrying about getting caught on camera from the neck up. And don't forget sunglasses to shield from the glare, since sun hats are generally frowned upon due to their view-restricting properties for the unlucky sods sitting behind you. ..