What's the weather like in Zhongshan, Guangzhou in January? What kind of clothes are suitable for wearing?
For men, it's easier. Many men in Guangzhou can wear a pair of jeans (or woolen pants), a casual (or formal) suit with woolen upper body, or a thin leather coat, a thin coat and a thin sweater inside, so they can spend the winter. However, it is really rare for men in Guangzhou to wear down in winter. Unless tourists (or those who often hang out in the suburbs) or Uniqlo are slim from time to time, I will see some strong boys passing by wearing sweaters, trench coats and jeans.
To sum up, it still depends on my parents' frost resistance and travel area. If I don't plan to go out early or go to the suburbs, the weather forecast will be sunny again in a few days. If I am a fashion person, I can refer to the fashionable white-collar MM (or the lighter dress method among men). Otherwise, you can refer to menstruation's dressing method (men can add long pants and slim down). As for autumn trousers, people have different opinions. I don't like to wear it anyway.
Let me remind you again that most public areas, vehicles and residential buildings in Guangzhou have no heating, and only some star-rated hotels have heating.
Welcome to Guangzhou. Have a nice trip.