Several Chinese netizens demanded to know why Mok was promoting such a brand, while others even called for a boycott of the singer.
The topic trended on Weibo for several hours on Saturday (June 12).
Mok has since removed photos of her wearing the D&G outfit from her social media accounts and the music video from all platforms.
Her agency and the designer involved in the outfit also apologised on Weibo.
D&G caused outrage in China in late 2018 when clips from its advertising campaign showed a Chinese model in a red D&G dress struggling to eat Italian foods such as spaghetti and cannoli pastry with chopsticks.
The backlash escalated after screenshots of messages sent from D&G co-founder Stefano Gabbana’s Instagram account were leaked, in which he allegedly said negative things about China.
Several celebrities such as singer Karry Wang and actress Dilraba Dilmurat then ended their ties with the brand.