Besides yellow robes, what did ancient emperors usually wear?

Ancient emperors in China wore red instead of yellow. After the Sui Dynasty, the emperor began to wear yellow robes, matured in the Song Dynasty and flourished in the Yuan, Ming and Qing Dynasties. But the emperors of Tang, Song and Ming still wore red robes. Looking at this picture, we can see that the clothes worn by the emperor are black and red. The clothes in the portrait of Li Shimin, the most famous emperor in the Tang Dynasty, are also red.