If you look closely, you will find that when the dancers gather around Song Zu Ying, her hands are untied at the left waist, and then, just like turning a page, the front "face" turns to the back.

If you look closely, you can also find that the waist of the white skirt is like the collar of ancient clothes (rattle or something), with the left layer and the right layer in a "Y" shape. Just to cover the "flowers" of the flower clothes.

The whole skirt "inside" is a normal skirt, with flowers in front and white in the back. Then there are "wings" on the right. When the wings are in front, the outside is white and the inside is flowers.

I don't know if I understand. . . .