I read this novel in the early 90s. It had a mostly white cover, possibly with a woman decked out in white fur. Here’s what I remember:

— Novel is set in the 1960’s and in the fashion industry.

— Main character was traumatized when, as a child,  she saw her mother, Coral, having sex and thereafter had a lot of problems.

— Her best friend is overweight, marries a drug addict named Alastair. She is also a fashion designer I think, in the style of Mary Quant.

— Coral, her mother, is a magazine editor I believe and nearly dies in a fire.

— Set in London and New York

— Potboiler type novel. Possibly with the word White in the title but maybe not … could just be confusing it because the cover was white.