How to change clothes in Hainan?

It's already hot in Hainan in March, so you have to bring some thinner clothes, such as short sleeves or at most long-sleeved T-shirts. Now I'm in Hainan. It's coldest at this time. All I need is a long-sleeved T-shirt and a plaid shirt. As for changing clothes, if you don't have to change on the train, the temperature difference on the train is not very big. When you get to the station, you can change it in the bathroom of the station, not to mention the plane. It will arrive in a few hours.