The hashtag "gross outfits at work" has been taking over Chinese social media platforms such as Douyin and Xiaohongshu.

Social-media giant ByteDance is seeking to leverage the popularity of its domestic short video app, Douyin, to widen the usage of the company's artificial intelligence (AI) chatbot Doubao.

Over four million people on Douyin, the mainland version of TikTok, marvelled at the video footage showing the couples, who looked alike and wore matching outfits, during the ceremony held on ...