They dressed – and partied with – the innermost in-crowd. As a swirling new show celebrates their fashion creations, Birtwell recalls her happy days with Clark and her sorrow at the loss of David Hockney In the mythical age of bohemia, the psychedelic decade between Mary Quant’s cheerful miniskirts and the first snarls of punk, Celia Birtwell and Ossie Clark were London’s most fashionable couple. Birtwell created the fabrics: daydreamy, botanical doodles that captured the idealism and looseness of the times in wisps of chiffon. Clark magicked these into sensual bias-cut dresses with a freewhee

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