Like many other traditional costumes of Vietnam, Non la has its own origin, coming from a legend related to the history of rice growing in Vietnam. The story is about a giant woman from the sky who has protected humankind from a deluge of rain. She wore a hat made of four round shaped leaves to guard against all the rain. After the Goddess was gone, Vietnamese built a temple to commemorate her as the Rain-shielding Goddess.Among conical hats, the nón lá of the Vietnamese people forms a perfect right circular cone which tapers smoothly from the base to the apex. Special conical hats in Vietnam contain colourful hand-stitch depictions or words while the Huế varieties are famous for their nón bài thơ (literally: poem conical hats). These contain random poetic verses and Hán tự which can be revealed when the hat is directed above one's head in the sunlight. Today, it has become part of Vietnam's national costume.

Vietnam's culture has developed over the centuries from indigenous ancient Đông Sơn culture with wet rice agriculture as its economic base. Some elements of the national culture have Chinese origins, drawing on elements of Confucianism and Taoism in its traditional political system and philosophy. Vietnamese society is structured around làng (ancestral villages); all Vietnamese mark a common ancestral anniversary on the tenth day of the third lunar month. In recent centuries, the influences of Western cultures, most notably France and the United States, have become evident in Vietnam.The traditional focuses of Vietnamese culture are humanity and harmony; family and community values are highly regarded. In the modern era, the cultural life of Vietnam has been deeply influenced by government-controlled media and cultural programs. For many decades, foreign cultural influences – especially those of Western origin – were shunned. However, since the 1990s, Vietnam has seen a greater exposure to Southeast Asian, European and American culture and media.