diaphanous
adjective literary uk/daɪˈæf.ən.əs/ us/daɪˈæf.ən.əs/
（尤指布料）又透又薄的，薄如蝉翼的
A diaphanous substance, especially cloth, is so delicate and thin that you can see through it.
a diaphanous silk veil 透明丝绸面纱
Synonyms: filmygossamer sheer transparent