Jane Birkin. Julia Restoin-Roitfeld. Clémence Poesy and Caroline de Maigret. Aside from their Frenchness, what do they all have in common? Their hair. No, it's not all the same colour or length, but their much-admired heads share a texture and insouciant swing that's universally French. Because French girl hair is never sleekly blow-dried, but always left sexily undressed. It's the kind of hair you can imagine sweeping down cobbled Parisian streets at midnight and emerging mid-morning looking even better than the night before.

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Whether your locks are more Lou Dillon dishevelment or Vanessa Paradis-style centre part, there are certain rules you have to follow to ensure your French-inspired bedhead is more chic than derelict. First up, French girls care for their hair. Invest in a nourishing shampoo and conditioner to ensure your locks are healthy and always freshly washed - all the better to mess up with product later. And forget blow-drying - French girls let their hair air dry to encourage their natural texture. If yours always falls flat, mop up excess moisture with a towel, then scrape into a bun until dry to get some movement.  

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Next, muss it up with styling powder at the roots, a blast of dry shampoo through the roots to mid-lengths and a healthy dose of texturising spray all over. If your locks are looking a little too wild, condition ends with a few drops of moisturising hair oil for just a touch of shine - and do as the French do and invest in regular treatments to keep longer lengths under control.  See our edit of must-have French hair products below:

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