What to wear to Hainan on March 23rd?

I'm in Haikou, and the weather in Hainan is warmer now. Boys can wear short sleeves most of the day, and it's a little cold in the morning and evening, because there is a sea breeze blowing. Therefore, it is necessary to prepare a few thin clothes that can be worn alone, and a thin coat is also necessary. It is enough for girls to wear one or two. Jeans can be taken. The temperature in Sanya is higher than that in Haikou. You can check that wearing shorts and a skirt with suspenders in Sanya should not be cold. But you know that if the weather changes a little, it will be different. Think about it.