Is there a Japanese in-joke here? The uchikake's hood is supposedly to cover a brides' "horns of jealousy," and Zero Two has actual horns, though of course if the bridegroom is who I think he is, those horns certainly mean something very different to him.

The way her flowery hairband in this image camouflages her horns as though they were additional flowers (as well as blending into the red of her kimono) does make them look rather beautiful.