EXCLUSIVE AT NET-A-PORTER. Olivia von Halle's 'Fifi' pajamas have swishy crystal fringe along the cuffs and cropped hems that makes the vintage-inspired set feel especially glamorous. They're made from plush velvet blended with a touch of silk and have a relaxed fit.Lower-Impact Materials. This product is made using at least 50% lower-impact materials or ingredients. Find out more about our NET SUSTAIN criteria here.