Clothing
The áo dài, a formal girl's dress, is worn for special occasions such as weddings and religious festivals. White áo dài is the required uniform for girls in many high schools across Vietnam. Áo dài was once worn by both genders, but today it is mostly the preserve of women, although men do wear it to some occasions, such as traditional weddings.[175] Other examples of traditional Vietnamese clothing include the áo tứ thân, a four-piece woman's dress; the áo ngũ, a form of the thân in 5-piece form, mostly worn in the north of the country; the yếm, a woman's undergarment; the áo bà ba, rural working "pyjamas" for men and women;[176] the áo gấm, a formal brocade tunic for government receptions; and the áo the, a variant of the áo gấm worn by grooms at weddings. Traditional headwear includes the standard conical nón lá and the "lampshade-like" nón quai thao.