Petite Plume Cosette Lace Trim Silk Nightgown Nordstrom 1960s robe periwinkle nylon Gem PETITE PLUME Silk Cosette Lace trim Nightgown Black Editorialist Petite Plume Periwinkle Lace Mulberry Silk Short Pajamas Nordstrom. Head to sleep in simple sophistication. This versatile, serene blue Robe is fabricated in 100% Mulberry Silk, offering a cozy feel that gets softer over time. This 22mm mulberry silk has the longest, strongest fibers of any silk. That means smoothness, durability, and a beautiful sheen. The machine washable silk is inherently breathable, temperature regulating, and hypoallergenic. In our exquisite sleepwear, you will be tucked in love and off to dreamland.