About traveling to Thailand and changing clothes

Actually, it's still very cold on the plane. It's winter in Thailand. Bangkok and its north are still a little cold in the morning and evening. You can't just wear short sleeves or something. The temperature in February is also average, not as hot as expected. Long-sleeved coat is a must. You might as well take your down jacket. You can use a vacuum compression bag. Take it off when you get to Bangkok and put it in a vacuum bag. It's not heavy. It doesn't take up space. You can still use it when you return to China.