here's the info from calvin klein's instagram:
Tonight, the stunning @EmmaWatson on the #RedCarpet at the Met Ball in a look crafted by the incredible team at @Calvinklein. With the help of @ecoage this 5 piece look is created from 3 fabrics woven from yarns all made from recycled plastic bottles. Plastic is one of the biggest pollutants – being able to turn this waste into a high quality material is a real success story. Also this beautiful look was designed with the intention to be repurposed for future use; the pants can be worn on their own, the train can be used for another red carpet - the ultimate #30Wears! #MetGala2016 Makeup: @therealdotti Hair: @visapyyapy