You only need a small amount of a fingering weight yarn, like the lovely handpainted Koigu multicolor shown here, to create the anchoring rows; add a dreamy mohair-blend lace weight yarn for the ruched sections that billow and drape.

Koigu KPPM in color #3611x (A)
CEY Pirouette (discontinued) in color #4035 chartreuse (B) (try Rowan Kidsilk Haze or Debbie Bliss Angel as a substitute)

Yardage: approx. 150yds of fingering weight yarn (A)
approx. 400 yds of lace weight mohair yarn (B)