请根据下面的短文内容判断句子，如果正确就填“T”,如果错误就填“F”,如果文中没有提到就填“N”。 The colorful clothes we wear today are made by machines.But what did ancient people do if they wanted to wear something colorful?Tie-dye(扎染)was a way to do this. More than 1,000 years ago,the Bai people in Yunnan used tie-dye to dye their clothes.Then this skill became so popular that people gave tie-dyed clothes to the emperor as gifts. To tie-dye,you need to first use tools to tie,sew(缝制) ,or clip(夹住)your cloth.The folded cloth is then put in dye.The Bai people usually make blue dye from a plant. As the cloth is folded,some parts become dark blue,while other parts have a lighter color.When you unfold the cloth,you will see beautiful patterns. In the 1960s,tie-dye became a fashion trend in the US.People tie-dyed T-shirts and jeans in imaginative ways.Many children in the US still learn tie-dye in their art classes. At a recent famous fashion show,an Italian designer surprised people with tie-dyed dresses.“Tie-dye is like an experiment.People cannot imagine the patterns of the cloth if they don't see them.It's a surprise,”the designer said.There is no doubt that the tie-dye trend has never really gone away.