 The Han also said their language was "animal shrieking" and that they lacked morals, modesty, civilization and culture.During the Vietnamese Trung sisters' rebellion (Khởi nghĩa Hai Bà Trưng - Đánh đuổi Tô Định) against the Han dynasty's First Chinese domination of Vietnam, the Han Chinese administrator of Jiaozhi (Vietnam), Sū Dìng (蘇定 Tô Định) only managed to escape to China and avoid being discovered by the Vietnamese rebels by shaving his long hair to blend in with Vietnamese along the way since shaving hair was a common custom of Vietnamese men of that era but not of Chinese men as Nguyễn Khắc Thuần recorded.Vietnamese wore a round neck costume, which made from 4 part of cloths called áo tứ điên.