لَا تَعْجَبُوا مِنْ بِلَى غِلَالَتِهِ ... قَدْ زَرَّ أَزْرَارَهُ عَلَى الْقَمَرِ
“Do not wonder that his undergarment wears thin; he has fastened its buttons upon the moon.”
A beautiful person is called a “moon,” bringing exceptional beauty to the foreground. Literal clothing on the celestial moon is not intended. The figure's effect lies in imagining the wearer as a moon and allowing that image to interact with the garment.
This differs from the sun-poem, where a figurative sun shelters someone from the literal sun. Both employ metaphorical naming and surprise, but the rhetorical relations and their results are not identical.