Nathalie Rykiel's new book, "It will be happiness", is out on March 6. The 68-year-old is a former director of the fashion group Sonia.

She talks about her blessed and joyful childhood, her chaotic youth, a zone of turbulence, and her serenity found as she got older. “For her, to have had all this, in the end, she says, ‘it will be Happiness’,” she says.