adjective

(especially of fabric) light, delicate, and translucent.

a diaphanous dress of pale gold

sheer,fine,ultra-fine,delicate,light,lightweight,thin,insubstantial,floaty,flimsy,filmy,silken,chiffony,gossamer,gossamery,gossamer-thin,gossamer-like,gauzy,gauze-like,cobwebby,feathery,translucent,transparent,see-through,transpicuous,translucid