The label was showing its new collection, with interest at fever pitch ever since Middleton announced her engagement to Prince William wearing one of its slinky silk dresses.

The U.K.-based label, Middleton's go-to choice for grown-up, ladylike outfits, is overshadowing such better-known designers as Daks, Jaeger and Jonathan Saunders, who are also showcasing their autumn and winter collections Saturday.