Naturally occurring fibers,such as cotton,flax,silk,and wool have been utilized by mankind for millennia.The silk gauze gown of Han-dynasty found in 1972 by archaeolo-gical discovery in Mawangdui Han Tomb weighs only 49 grams.It demonstrates the advanced silkworm cultiva-tion,harvesting and weaving techniques in the early Han Dynasty in China.Even today,we are not able to replicate this silk gown with such light weight.For a long time,silk product from China means"fabulous","gorgeous","dreamlike clothes"to the western people.