Kate's the duchess in denim dungarees: Clinging 70s-style 'jumpsuit' worn by Duchess for Vogue photoshoot 

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Retro: How Kate might look in AG Jeans jumpsuit

It’s meant to be the height of fashion, although some might think it owes more to Seventies sexpot Felicity Kendal.

This is the clinging 70s-style denim ‘jumpsuit’ worn by the Duchess of Cambridge in her first magazine photoshoot.

Made by AG jeans, the rather inappropriately named Lolita Cutie costs £312 and is, apparently, cut for a ‘sensual vintage-inspired fit’.

Kate paired it with a cashmere jumper by supermodel Claudia Schieffer for TSE, which would have cost around £400, and a pair of £115 navy suede ankle boots by Dune (although the photographs cannot be published here due to copyright restrictions).

The ‘Good Life’ theme - reminiscent of the popular BBC sit com - is followed through in several other portraits with the Duchess also wearing checked country-style shirts by Burberry and Cabbages and Roses, 7 For All Mankind jeans and a Beyond Retro vintage hat.

Although she has turned down numerous magazine covers, Kate, 34, agreed to become a model for the day to mark Vogue 100: A Century of Style exhibition at the National Portrait Gallery (NPG), of which she is patron.

The portraits, shot by trendy snapper Josh Olins in countryside close to the Duchess’s Norfolk Home, appear in the latest edition of the fashion magazine, with two on display at the NPG in London - neither of which, it should be said, feature the, ahem, jumpsuit.

According to Vogue the Duchess wanted the photographs to be as ‘informal’ and as ‘countryside’ as possible.

‘She didn’t want to be dressed as a fashion plate and was not keen to be shot in gala gowns and tiaras,’ it says Instead its fashion director gathered a wardrobe based on what Kate likes to wear when she is ‘off-duty’ – ‘jeans, shirts, T-shirts. The same as the rest of us.’ Kate, Vogue said, showed a refreshing ‘lack of vanity’, allowing the magazine’s stylist and make-up artist to have free reign and posing without complaint in freezing temperatures, often in just a thin shirt.

And for a male model companion Kate chose her own dog, spaniel Lupo, whose glossy black coat appears to have been equally primped and preened.

Lupo’s appearance in the magazine (complete with a credit – ‘the family dog, Lupo, proved a willing partner on set’) is a remarkable turn-about: Kensington Palace refused to even confirm his name when the couple got him as a puppy as it would have been a ‘breach of their privacy’.

The magazine also hilariously revealed that Kate drove herself to their shoot in Land Rover with her hair in curlers - a look beloved of WAGS everywhere.

Once a total fashion no-no, Coleen Rooney, Abigail Crouch and Alex Curran have all happily walked down their local high street, with their jumbo Velcros in.

Despite having a team of high flying fashionistas at her fingertips, the royal, it seems, had settled for her tried and trusted crimper, Amanda Tucker, to wash and her set her hair at home before they left.

According to the magazine’s editor, Alexandra Shulman, the duchess even joked about what passers-by must have thought as she drove herself to the shoot in rural Norfolk.

She writes in the June edition of the magazine, out this week: ‘We drank coffee and everyone prepped until the Duchess arrived, in jeans and a parka, her hair in big rollers, with a bright, inclusive smile.

Country girl: A casual Kate in 2011 - Vogue revealed Kate arrived to the shoot with her hair still in rollers

‘She walked through the small cottage door with her hairdresser, Amanda Tucker, who was dragging a wheelie case of products. 

The Duchess joked about how she must have appeared to anyone who saw her driving the car in her rollers, before introducing herself to everyone she hadn’t yet met.’ 

Coleen Rooney, it has to be said, has defended the look saying: ‘If I go to the hairdresser before a night out, I’ll often leave the rollers in and take them out at home.

‘I don’t care what people think, as long as my hair looks good when I go out.’ But quite what anyone might say about a future Queen of England wearing them out is anyone’s guess.