Regular followers might recall that back in May Colin and I spent an evening... I am pausing to pinch myself here... with the Obamas and the Queen - see it here. At the risk of repeating myself, it was one of the highlights of my year!

But one element of that night that I have no problem repeating is the gown created by Henrietta Ludgate. It's one of my favourite pieces created for the GCC so here it gets another public outing. Due to royal protocol it wasn't photographed last time either (apart from a slightly hazy snap I took quickly in the garden!). Besides, what better occasion than the British Fashion Awards? If I were one of the judges, Henrietta would win the Emerging Talent awards hands down.

JOIN VOGUETV AT THE BRITISH FASHION AWARDS

Henrietta's talent is innate. She has a quirky viewpoint but knows how to execute design eccentricity with precision and gloss. From my previous blog you will remember that this dress is "made from end-of-line duchess silk satin, all the material for this piece was sourced locally - not only giving this dress a very low carbon footprint but allowing the process to go from design to finished garment in a matter of days. The artisan pleaters used in the making of this dress have been going since the Twenties and are one of the few remaining artisan pleaters in the UK. And as an extra green-aside, even the pleating was achieved using a steam heat chemical-free process!"

SEE RED CARPET STYLE AT THE BRITISH FASHION AWARDS 2011

But for the British Fashion Awards I'll team it with a stunning Alexander McQueen clutch. (This underlines the gigantic crush I have on Sarah Burton who is outrageously talented) and earrings from the Cartier vintage collection.  (Listen for some Cartier-related announcements from me in the New Year). The shoes are my favourite Roger Vivier emerald green stilettos making yet another appearance for the GCC.

WHO WON WHAT AT THE BRITISH FASHION AWARDS 2011

This brings us to the close of the Green Carpet Challenge 2011. It's one that included a visit to the Oscars and a Met Ball first! I can hardly wait to tell you what we've got in store next year as the challenge goes up several gears. Thank you so much to everybody who has supported us this year and to all of you who believe that fashion has an exciting sustainable future. And to anyone who is waiting to be convinced - we're coming to get you in 2012!

Have a happy (eco) Christmas!

READ THE LATEST FROM THE GREEN STYLE BLOG

As you know we've developed a big Green Carpet crush on Stella McCartney. Not only did she work with us to produce a beautiful sustainable one-off piece for the Met Ball, but she leads the fashion pack; working hard to make her collections sustainable in every sense of the word, while sacrificing none of the glamour or aesthetic. Last night was also Stella's birthday, so in her honour I wore a Stella dress to the London premiere of Tinker, Tailer, Soldier, Spy.

SEE WHO CELEBRATED STELLA'S BIRTHDAY

Let's just say it caused a few double takes! Firstly, you'll notice it's sheer down one side. Only a great designer can make something this risqué so chic, and I have to say I felt completely comfortable. Secondly, it had been (cue dramatic drum roll), WORN BEFORE! If there's one bit of red carpet tyranny we'd love the Green Carpet Challenge to dispense with, it's the idea that no two women must ever be seen in the same dress. In many ways this dictat just plays into the whole consumer churn and fast fashion cycle that we're trying to avoid. So we say "why on earth not?" When you've got a great designer, and a great piece, shouldn't that piece be outed as many times as possible?

SEE THE DRESS ON THE CATWALK

Now, who wants to wear it next?

SEE LIVIA PARTYING WITH STELLA AT FASHION'S NIGHT OUT

SEE THE BEST DRESSED STARS AT THE VENICE FILM FESTIVAL

The 68th Venice Film Festival

So here we are again. Another Green Carpet Challenge and this season the stakes are even higher! Tonight in Venice the dress is my own design. Designed for Yoox.com, it's a 50s inspired strapless satin cocktail dress embellished with crocheted angora polka dots, made with upcycling specialists, Reclaim-to-Wear in an Italian social justice enterprise (a cooperativa) and will be on sale from November. Venice is a magical place (not only for me, obviously!) so I felt like this was the right platform to launch this dress. I am at home in Italy and for me this city always resonates with the glamour of Grace Kelly and co. My friend Warly Tomei came to the rescue on the jewellery front, ordering me to a fantastic vintage shop owned by Mr Carlo Eleuteri - and something of an Italian institution. I can't quite describe the nerves when you wear a dress that you've designed yourself but people seem to like it and they love the story of the cooperativa that made it (coming soon!) so that has helped to keep me superficially calm. I hope you approve!