autumn leaves likened to a garment
A poetic metaphor comparing the beauty of autumn leaves to a robe or garment. Used in classical or literary contexts; not an everyday expression.
See also: 紅葉衣
The whole mountain looks as if it is wearing a garment of autumn leaves.
From 紅葉 (autumn leaves) + の (possessive particle) + 衣 (garment). A classical poetic phrase.