Fashion moment: Alexa's thighs have it

ASK a fashion insider about trends for this season, last season or autumn/winter 2012 for that matter, and it's likely that among the usual suspects – romantic, military, gothic etc – "rock chick" will feature in there somewhere. Looking like the stoned and grubby girlfriend of a stoned and grubby musician never seems to go out of fashion.

Neither grubby nor stoned (we think) was Alexa Chung, who accompanied her vaguely grubby and possibly slightly stoned boyfriend Alex Turner of the Arctic Monkeys to Glastonbury last week wearing the rock chick's festival uniform of stripy T-shirt, high-waisted denim shorts, wellies, a leather jacket and a fedora.

Only she somehow managed to rise above all those festival clones and look unique, original, chic. In fact, in such an impeccable ensemble, she could have gone straight from Glasto to the front row of the Chanel couture show in Paris this week without so much as a re-application of lippie. It's difficult to put one's finger on exactly why the T4 presenter stands out among a sea of girls wearing essentially the same outfit, but after some complicated mathematical analysis, we understand it to be a combination of the brim of her hat (wider than the passé Sienna/Kate/Keira fedora) the jaunty angles of the lapels on her jacket and (the most likely one) the perfection of her thighs.