How was the round neck robe designed in the Tang Dynasty?

In the Tang Dynasty, the left and right lapels were overlapped on the chest, and the lapels were lifted to the neck with belts or buttons, fixed on the side of the neck, and matched with appropriate tailoring to form a round neck. This kind of closure is different from the previous generation of Hanfu's "cross-neck right slit", which shields the human body more closely and enhances the ability to resist sandstorms.