It's impossible to think of fashion in the 70s without Annie Hall immediately springing to mind. Or more specifically, the image of a bespectacled Diane Keaton in billowing trousers, teamed with a shirt, tie and waistcoat.

But while we're fascinated by the clothes in the film, we're also mesmerised by the hairstyles of Keaton and the rest of the cast. Keaton's messy, honey blonde locks, falling loosely around her shoulders or half-tucked into a fedora hat, seem so current – not to mention Carol Kane's curly, candy floss-textured fringe and Shelley Douvall's cute pigtails. Even some of the children in the film give the likes of Keaton and Duvall a run for their money when it comes to signature 70s 'dos. Whimsical and naive, every Annie Hall hairstyle seems to further reflect the kooky charm of Keaton herself.

The film stars Woody Allen as a neurotic New Yorker Alvy Singer who explores why his relationship with Annie Hall (Keaton) has broken down. But instead of plunging into the depths of melancholia, Keaton and Allen bring a quirky charm and bittersweet humour to the story. ('A relationship, I think, is like a shark. It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark.') 

It's a romantic comedy for those who hate romantic comedies. With some seriously cool clothing and hairstyles to boot.

Scroll down for every single amazing hairstyle in Annie Hall:

1. Diane Keaton's 'laissez-faire' hair

This look is classic Keaton: no fussy layers or polished styling required – just left loose with a simple centre-parting. The mussed up texture gives this style a tomboyish air to go with the rest of her outfit.

2. Carol Kane's Botticelli fringe

We've noticed more and more people choosing to have a curly fringe of late – another quintessential 70s look. Carol Kane notably sports such a look in the film, while the rest of her fluffy blonde curls are swept up into a high ponytail. 

3. Alvy's classmate's textured pageboy bob

Like the curly fringe, the humble bob is no longer the poker-straight and geometrically precise creature it once was, but has lately become slightly more free-spirited. This textured wavy style, seen here on this cute schoolgirl in Alvy's class, is complemented by her thick-framed spectacles.

4. Shelley Duvall's Pippi Longstocking pigtails

Pigtails are a brave choice for anyone past the age of 16, but Duvall just manages to pull it off - pairing it with apricot-hued skin and Greta Garbo brows.

5. Janet Margolin's 'left-wing intellectual New Yorker' chignon

This hair would look a tad prim and proper if it weren't for the bright and knowingly 'ethnic' jewellery Margolin is wearing it with. With her radiant skin and glossed lips, it's Upper East Side escapee meets West Village boho at its finest.

6. Alvy's classmate's 'Alice in Wonderland' hair ribbon

Despite being mainly the preserve of schoolgirls (seen here on the object of Alvy's unfortunate childhood crush), we think there's a lot to be said for a striking, white hair ribbon, especially when paired with a poker-straight fringe and loose curls. Quintessentially 70s, yet perfect to pair with a tank top and denim cut-offs for festival season.

7. Diane Keaton's 19th Century-style up do

Seen here as the couple play-fight with live lobsters (ain't love grand?), Keaton channels Little House on the Prairie with this beguiling twisted up-do, clipped up at the back. The result is timeless without looking too try-hard.

8. Diane Keaton's silky 'Timotei' tresses teamed with shades

This look just makes us dream of spending a summer in 70s New York, our hair cascading softly around our shoulders like Keaton's, with an ever-so-slight kink to it.

9. Shelley Duvall's poker straight Ali MacGraw locks

Making a strong case for why people with fine hair shouldn't feel obliged to hack it all off, Duvall's wispy, straight hair exudes a certain kind of hipster cool. 

10. Diane Keaton's 'morning after' messy chignon

Few hairstyles are as subtly sexy as a casual topknot (the hair equivalent of wearing a man's shirt over lingerie). And if your hair happens to possess the silky texture of Diane Keaton's, then so much the better.

11. Diane Keaton's haphazard hat hair

The most iconic look from the film, there's something delightfully slap-dash about the way Keaton's hair is shoved into the hat, with one loose piece artfully framing her face at the front. It's a look that Keaton is still best known for today - and one that will be forever be synonymous with 70s style.