I agree that the "beading" looks like raffia made from straw but it appears to be applied or woven into on into a plain crepe like ground. It looks like the skirt is made from the same fabric as the top - minus the raffia. Is the raffia or whatever the beaded part is made from stitched through at any point or glued on?
Thanks for the replies The top part with the raffia is actually a sheer material with it stitched on - here are some photos. I didn't think to photograph that which is pretty important in determining the material!! Sorry!