They used two types of fabrics: a polyester lining (chosen because it’s a cheap solid-colored cloth that drapes well), and shimmer organza, which is iridescent (blue-purple and green-red).
They hung the fabrics on their boom and used a steamer to make those wrinkles disappear as they raised the booms.
The lighting was done using their fresnels above and 4 pars to under-light. There were minimal gels — a red one or two to bring out the red in the green shimmer organza, which has red threads in it.
The center opening was made using a griff clip attached to the edge of the fabrics and lifted up with a black rope.