A woven sandal from a cave in Missouri has been dated to 8300 years old. It was made from the leaves of a yucca-like plant with the common name rattlesnake master.  The sandal is surprisingly similar in design to modern Huarachi shoes from Mexico.  The story was featured in the New Scientist in the link below:

http://www.newscientist.com/article/mg15921422.300-secondhand-shoes.html

The accelerator mass spectrometer dating was done by Michael J. O’Brien and colleagues and appeared in a 1998 report in Science titled “7500 Years of Prehistoric Footwear from Arnold Research Cave, Missouri“.