The earliest evidence of weaving in Japan is associated with the Jōmon period. This culture is defined by pottery decorated with cord patterns. In a shell mound in the Miyagi Prefecture, dating back about 5,500, some cloth fragments were discovered made from bark fibers. Hemp fibers were also discovered in the Torihama shell mound, Fukui Prefecture, dating back to the Jōmon period, suggesting that these plants could also have been used for clothing. Some pottery pattern imprints depict also fine mat designs, proving their weaving techniques. The patterns on the Jōmon pottery show people wearing short upper garments, close-fitting trousers, funnel-sleeves, and rope-like belts. The depictions also show clothing with patterns that are embroidered or painted arched designs, though it is not apparent whether this indicates what the clothes look like or whether that simply happens to be the style of representation used. The pottery also shows no distinction between male and female garments. This may have been true because during that time period clothing was more for decoration than social distinction, but it might also just be because of the representation on the pottery rather than how people actually dressed at the time. Since bone needles were also found, it is assumed that they wore dresses that were sewn together.