How much clothing should I wear to keep warm in Hong Kong?

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I have checked the weather in Hong Kong for November to December, it appears to be around the range of 16-20 degrees. I haven't been to cold weather countries, and I live in a relatively hot country.
How thick of a sweater do I need? How much clothing should I always be wearing to keep myself warm when in outdoors during this period?
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What should you not wear in Hong Kong?
Inappropriate clothing: Do not wear revealing or see-through clothing as it proves to be disrespectful in Hong Kong. The Hong Kong society is very modest and does not easily accept that kind of clothing. Avoid black: Avoid wearing pure black and white outfits as they are sometimes seen as a representation of gangs.What clothes do people in Hong Kong wear?
Generally, older Hong Kong people dress modestly \u2013 no short skirts, no strappy tops nor generally tight or revealing clothes. However the same cannot be said about the young! In the full heat and humidity of summer you will see plenty of camisoles, t-shirts and shorts.How cold does HK get?
Winter. By local standards, winter in Hong Kong is generally colder with temperatures ranging from 15C \u2013 19C. However, because of northeast winter monsoon, temperature during winter can drop below 10 degrees. The lowest temperature ever recorded in the history of Hong Kong is 0.0 degrees.How should I dress in a cold country?
When getting dressed in the winter, use the CDC's checklist below as a guide.A Guide To Winter In Hong Kong
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