لا تعجبوا من بلى غلالته، قد زر أزراره على القمر
Do not wonder that his garment is worn: he has fastened its buttons upon the moon.
The beloved is imagined as the moon (qamar). The poet extends the image by locating the garment’s buttons upon that “moon,” offering a fanciful reason for the torn garment.
Neither the person’s literal identity with the moon nor the fastening of buttons onto a celestial body is being asserted. The poem works through imaginative association, not through an externally verified cause.