Why is Dunhuang Feitian naked in the upper body?

The flying image of Dunhuang Grottoes, in its early days, was Western-style, with a half-naked upper body, a narrow crown and skirt, no wings and no clouds, flying in the air with two streamers. According to today's headline query, Feitian is the attendant of Buddha and Bodhisattva, specializing in playing the piano and fragrant flowers, and is a god who brings happiness to people. The flying image in Buddhist art is delicate, elegant, lively and graceful, which is in sharp contrast with the solemnity of the Buddha statue and shows the aesthetic imagination of ancient artists. In the early days, the flying image of Dunhuang Grottoes was Western-style, with a half-naked upper body, a narrow crown and skirt, no wings and no clouds, flying in the air with two streamers. In the later period, it was the Central Plains style, showing off bones and clear images, praising clothes and wearing belts, and the ratio of head to body gradually developed from one to four in the early period to one to six or one to seven. The figure was slimmer, the dance was more charming and enchanting, and it had a high sense of dynamic rhythm. The flying statue in Cave 133 of Maijishan is a sculpture of the Northern Wei Dynasty. Graceful posture, head crowned with a bodhisattva, comely face and smiling face, legs bent, feet hidden under the heavenly clothes, streamers in an oval shape, flying behind, with a light posture like soaring clouds, is a rare masterpiece among flying sculptures, reflecting the national characteristics of China's sculpture aesthetics.