Indanthrene blue is a kind of cloth produced in China, which was first produced in the early Republic of China and has a long history. Its pure blue-green, fresh and elegant. After liberation, monochrome Indanthrene blue cloth was gradually ignored. But in the early 1970 s, when material resources were scarce, only one person distributed 6-foot cloth tickets throughout the year. Most people only wear navy blue, dark gray and plain blue, which is very monotonous. For women, especially girls, buying printed cloth for clothes does not meet the requirements of "revolutionization", otherwise it will be considered as "pursuing petty bourgeoisie sentiment" As a result, the woman who naturally loves beauty quietly likes Lin Lan. They like to use Indanthrene blue cloth as winter cotton-padded jacket, with dark tweed trousers, and a white silk scarf or a big scarf made of wool rabbit hair to add a bit of life to the dull and monotonous city.