Jessica McClintock, the San Francisco-based designer who dressed legions of prom-goers, has died at the age of 90.

Having worked with McClintock in organizing the West Coast edition of the CFDA’s charitable “Seventh on Sale” in the early 1990s, Fern Mallis said her support, as well as the support of executives at Gap Inc. and other San Francisco-based companies, helped to raise millions of dollars. Mallis said, “She was the quintessential San Francisco designer who never seemed to get the respect from the fashion industry that she deserved because she had an incredible business.”