Model Lily Cole kicked off Vivienne Westwood's Red Label show at London Fashion Week with a modern dance.
Westwood said the solo performance was a metaphor for their climate change concerns; a theme which ran through the show.
Westwood said: "I just use fashion as an excuse to talk about politics. Because I'm a fashion designer, it gives me a voice, which is really good."
The show closed with an appeal to the audience to fill in a climate change postcard to send to the UN Secretary General Ban-Ki-moon.
London fashion week kicks off with big names like Vivienne Westwood, Paul Smith, Burberry and Stella McCartney showing the world how to dress to impress.
58 catwalk shows will debut trends and looks for the 2014 spring and summer collections.
British designer Jasper Conran will be among the first to the catwalk, while the top names tomorrow include Julien Macdonald and Henry Holland.
US designer Tom Ford returns with a show on Monday, while McCartney will display her collection for Adidas on Tuesday.
The event is expected to attract more than £100 million in orders, according to the British Fashion Council (BFC), as buyers, journalists and bloggers descend on London to spot the latest trends.
Dame Vivienne Westwood today visited Wikileaks founder Julian Assange at the Ecuadorian Embassy in London where he has been living since the summer, when he was granted political asylum by the Latin American country
The fashion designer showed her support for the Australian whistle-blower by wearing a T-shirt with her face on, accompanied by the slogan "I am Julian Assange".