Why are there two rabbit ears on Ming Taizu's hat?

That's not a rabbit's ear, it's called a "golden horn"

Each dynasty has its own clothing characteristics, which represents the understanding of beauty and an aesthetic taste in that period, and integrates the characteristics of economy, national culture and other aspects of that period, as well as the preferences of rulers in that period. What the people above like, the people below will vote for.

That kind of hat is called "wing crown"

Wing good crown is a kind of crown, which is the earliest dress worn by emperors, princes, princes and county kings in Ming Dynasty, and also the earliest dress worn by Korean dynasty, Wang Shizi, Vietnamese emperor and king of Ryukyu Kingdom.

In the third year of Yongle in the Ming Dynasty, the emperor wore a black veil crown on his uniform, which was also called a wing crown.

The emperor used to wear a crown. Because of the corner of his black hat, he added the word "good" and was later named "Wing Good Crown"

The "wing good crown" in the Ming Dynasty is much simpler than that in the Tang Dynasty. This wing crown is divided into three parts: the front room, the back hill and the golden corner. There are two dragon play beads on the crown.