diaphanous

If a dress is so see-through that light shines through it, it's diaphanous. You could also call it "sheer" or "transparent," but diaphanous sounds much fancier.

If you want a classic example of diaphanous clothing, check out all those nineteenth century Romantic paintings of goddesses clad in lightweight gowns flouncing around in the middle of forests at night. Those gowns are diaphanous, and so are the fluttery translucent muslin curtains in your kitchen window and the gauzy tutu your little sister loves to wear. The Greek root, diaphanes, "see-through," combines dia-, "through," and phainesthai, "to show."

Definitions of diaphanous
  1. adjective
    so thin as to transmit light
    “a hat with a diaphanous veil”
    synonyms: cobwebby, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous
    thin
    of relatively small extent from one surface to the opposite or in cross section
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