Cellulosic Yarn/Fabric NAIA

Beyoncé wearing NAIA

Beyoncé wearing NAIA

From Eastman Lab's site: 

Eastman Naia™ cellulosic yarn, the new name in fashion apparel, offers a differentiated product for brands looking to innovate in their next collection. Create comfortable, easy-to-care-for, and luxurious fabrics—all thanks to inherent qualities found in Naia™ from Eastman.
COMFORT   Incredibly soft, superior breathability, inherent moisture management
EASE OF CARE  Washable at home, excellent wrinkle recovery, practical for everyday life
LUXURY  Silky hand, beautiful luster, high quality fabrics your customers expect

NAIA website.