Science News says the dig is taking place in western China.

The pants are described as “not only functional but relatively stylish.”

The wool pants were found with the remains of two men, each about 40, who lived about 3,300 years ago and likely rode horses.

Time reports the custom nature of the find confirms ancient people used several methods to make their clothes. "Rather than the modern method of cutting down large pieces of fabric, the early pants were woven on a loom in precisely-sized segments to form the final garment, like nomad couture."

More here.

http://youtu.be/PREv5Q1t4dM