Inventories are being kept tight in hope of increasing full-price selling and reducing markdowns.
The music star had launched the collection last February during New York Fashion Week.
New campaign is aimed at pressing Congress to pass legislation that would give states the authority to collect sales taxes from e-commerce.
She has been named editor in chief of the Web site and magazine Nowfashion.com, which covers runway shows and other fashion events online, in real time.
When La Stampa journalist Gianni Riotta posted a tweet asking “can Italian fashion do something in honor of these kids?” the responses came pouring in.
The designer was besieged with phone calls after Priscilla Chan donned one of her dresses to marry the Facebook founder on Saturday.
Guests at the event at Sotheby’s in London on Friday afternoon included Bianca Jagger, Yasmin Le Bon, Roksanda Ilincic and Lara Bohinc.
The 19-year-old model’s Step Forward team was among the top five raising funds for AIDS charities, with a generous contribution from Juicy Couture.