The Driglam Namzha (Tibetan: སྒྲིག་ལམ་རྣམ་གཞག་, Wylie: sgrig lam rnam gzhag) is the official behaviour and dress code of Bhutan. It governs how citizens should dress in public and how they should behave in formal settings. It also regulates a number of cultural assets such as art and architecture. In English, driglam means "order, discipline, custom, rules, regimen" and namzha means "system," though the term may be styled "The Rules for Disciplined Behaviour."
The Driglam Namzha traces its roots directly back to the 17th century pronouncements of Ngawang Namgyal, 1st Zhabdrung Rinpoche, the Tibetan lama and military leader who sought to unify Bhutan not only politically but culturally as well. He established guidelines for dzong architecture, the characteristic monastery-fortresses of Bhutan. He also established many of the traditions of the tshechu "district festival" such as the Cham dance. These guidelines were intentionally codified to encourage the emergence of a distinctive Bhutanese identity.
In 1989 the government elevated the status of the dress code from recommended to mandatory. Afterward, all citizens were required to observe the dress code in public during business hours. This decree was resented by Lhotshampas in the southern lowlands who voiced complaints about being forced to wear the clothing of the Ngalop people.
Under the Driglam Namzha, men wear a heavy knee-length robe tied with a belt, called a gho, which is folded in such a way to form a pocket in front of the stomach. Women wear colourful blouses called wonju over which they fold and clasp a large rectangular cloth called a kira, thereby creating an ankle-length dress. A short silk jacket or toego may be worn over the kira. Everyday gho and kira are cotton or wool according to the season, patterned in simple checks and stripes in earth tones. For special occasions and festivals, colourfully-patterned silk kira and, more rarely, gho, may be worn.