gileonnen:

“It is told in the Lay of Leithian how she escaped from the house in Hírilorn; for she put forth her arts of enchantment, and caused her hair to grow to great length, and of it she wove a dark robe that wrapped her beauty like a shadow, and it was laden with a spell of sleep. Of the strands that remained she twined a rope, and she let it down from her window; and as the end swayed above the guards that sat beneath the house they fell into a deep slumber. Then Lúthien climbed from her prison, and shrouded in her shadowy cloak she escaped from all eyes, and vanished out of Doriath.”

And now this robe she round her furled,
and veiled her garments shimmering white;
her mantle blue with jewels bright
like crystal stars, the lilies gold,
were wrapped and hid; and down there rolled
dim dreams and faint oblivious sleep
falling about her, to softly creep
through all the air.

J.R.R. Tolkien, The Lay of Leithian (via tolkien-minor-characters)