Diaphanous
/daɪˈæf.ə.nəs/ adjective hardLight, delicate, and so thin that it is nearly see-through.
The bride's diaphanous veil floated behind her like a cloud of mist as she walked down the aisle.
Memory Trick
'Dia-' means through (as in 'diagram'), and the rest of the word relates to showing or appearing — something diaphanous is thin enough to let light show straight through it.