Sonia Rykiel: French fashion designer dies at 86

French fashion designer Sonia Rykiel has died at the age of 86.

Rykiel, nicknamed the Queen of Knitwear, had been suffering from Parkinson's disease for some time before her death on Thursday.

Nathalie Rykiel, managing and artistic director of the Sonia Rykiel fashion label, said: "My mother died at 05:00 this morning at her home in Paris from the effects of Parkinson's."

French President Francois Hollande praised her as "a pioneer". He said of Rykiel, whose relaxed striped knitwear was seen as a shift away from more formal suits:

"She invented not just a style but an attitude, a way of living and being, and offered a freedom of movement."

Rykiel was born Sonia Flis in Paris in May 1930, to a Romanian father and Russian mother.

She started her career as a window dresser in 1948, with her first foray into design being when she knitted herself maternity dresses after marrying Sam Rykiel, the owner of a Paris boutique.

Rykiel made her breakthrough in 1962 with the so-called poor boy sweater, which had long sleeves and a fitted shape.

Rykiel opened her first ready-to-wear store on Paris's Left Bank in 1968 and her fashion empire went on to include menswear, children's clothing, accessories and perfumes.

According to her website, Rykiel "urged women to be eccentric, seductive, mysterious, and to create their own style".

During her career she developed new techniques like inside-out stitching and no-hem finishings, with other star pieces including embroidered knitted tops and rhinestone-studded berets.

Rykiel wrote several novels and also featured in 1994 film Pret-a-Porter, Robert Altman's satirical take on the fashion industry.

In a 2005 interview, she said she had been plagued by doubt in her early career.