‘Hey, it was great! It looked fantastic,’ hollered Mick Jagger, gripping his girlfriend’s hand with a mile-wide smile.

L’Wren Scott at London Fashion Week? That’s right. Just picture the woman for a second, the six foot seven inch glamazon, super-elevated in stilettos, those soaring needle-slim legs and tumbling glossy raven hair. Then imagine her svelte frame coated in 23-carat gold – the decadent ‘fabric’ with which she let rip on the LFW runway in the grand banquet hall at the Royal Institute of Engineers where guests were served shepherd’s pie by elegant waiters – and you’re getting the picture, aren’t you? - of a collection dripping in Hollywood opulence.

She had been inspired by turn-of-the-century artist Gustav Klimt, during the ‘Golden period’ and his muse Adele Bauer. ‘His muse and my muse,’ she said, ‘He was so in love with her and I am so in love with my work, it’s an obsessive love. And I wanted to turn all that into our signature styles.’ Cue body-curving silhouettes, with sharp-shouldered jackets and strict pencil skirts cut precisely below the knee, lavish capes, long fishtail gowns bestowed with embroideries or colourful prints – of serpents and leaves – that echoed Klimt’s most famous paintings.

When asked about showing at London Fashion Week, Scott, looked to the floor shyly for a moment. ‘It’s like coming out of the shadows,’ she said. True, quite literally, this collection shone, from the 23-carat (yes, 23, apparently it has the precise special lustre, she favours) shoes to the floor-sweeping cape embroidered with gold-thread leaves. Asked if her own glittering gold cardigan was made of the stuff, she said: ‘No! I couldn’t afford it, I had to stop somewhere.’ How expensive might these creations be, asked one journalist: ‘Well, gold retains its value, so that’s good news,’ she added. Her collection, she insisted, was all very wearable – particularly the pieces with in-built jewellery: ‘I love that idea, so much easier when you travel.’

It was a knockout performance in how to look decadently sophisticated. And a reminder of just how richly diverse London Fashion Week has become.