Ulos is the traditional cloth of the Batak people of North Sumatra. Different kinds of ulos have different ceremonial significance. The ulos is normally worn draped over the shoulder or shoulders, or in weddings to ceremonially bind the bride and groom together. Ulos are traditionally hand woven and in the case of higher-quality examples are significant family heirlooms, to be worn at important events, such as funerals and weddings.
With increasing modernisation has come the decline in significance of the ulos, with many varieties no longer in demand.