What clothes do you wear in the coldest time in Thailand?

Short sleeves, shorts, large temperature difference between morning and evening, you can bring a thin coat.

Bangkok, south-central Thailand, south of Dacheng, is located in the tropics. It is hot all year round, and the temperature difference is not big all year round, which can be described as four seasons like summer. The average winter temperature in northern Thailand is only about 18-24℃, so it is light and casual to wear. You can wear it with some sweat-absorbing and breathable cotton T-shirts and shorts, which may be slightly cold in the morning and evening. You can bring a shirt or a thin coat.