When the weather turned cold in December, Cindy Luo started to wear her fluffy pajamas over a hooded sweatshirt at the office. Wearing cozy sleepwear to work became a habit and soon she didn’t even bother to wear matching tops and bottoms, selecting whatever was most comfortable. A few months later, she posted photos of herself to a “gross outfits at work” thread that had spread on Xiaohongshu, a Chinese app similar to Instagram. She was one of tens of thousands of young workers in China to proudly post pictures…