Diaphanous (adjective)

1. So thin as to be transparent or translucent.
2. Allowing light to pass through; transparent or translucent.

Origin:

Early 17th century: from french diaphane or latin diaphanus, from greek diaphanēs "transparent".

Examples:

1. The diaphanous curtains billowed in the breeze.
2. The diaphanous dress was made of delicate silk chiffon.
3. The butterfly's wings were diaphanous and iridescent.
4. The water was so clear it was almost diaphanous.
5. The diaphanous veil added a touch of elegance to the bride's appearance.