She fought a long battle with cancer before passing away at a hospital near her Sussex home on Thursday.
Born in France, Walker made a name for herself in Britain as one of the country's leading couture designers.
She provided Diana with many of her most iconic outfits, having first worked with her three months after her wedding to Prince Charles in 1981. The Princess was buried in a black dress designed by Walker that she had bought in the weeks leading up to her death.