Sozzi said investors should "look no further" than Ralph Lauren's annual report, in which it listed the loss of the designer's services as a key risk. Kors, who shot his label to fame by serving as a judge on the TV show "Project Runway," has also given no clear signal of a successor, Sozzi said.
In Scott's case, her loss will be most felt at her eponymous label, which was shown during London Fashion Week. Her death will not have as large of an impact on Gap's Banana Republic business, which created a capsule collection with the designer for Holiday 2013.
Still, the company was rocked by the news.
"We are stunned and saddened to learn of the loss of L'Wren Scott. Our hearts and prayers go out to her friends and family," a Gap spokesperson said.
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