now of that cloudy hair tinuviel wove a robe of misty black soaked with drowsiness more magical far than even that one that her mother had worn and danced in long long ago before the sun arose , and therewith she covered her garments of shimmering white , and magic slumbers filled the airs about her ; but of what remained she twisted a mighty strand , and this she fastened to the bole of the tree within her house , and then was her labour ended , and she looked out of her window westward to the river .