What is the weather like in Harbin now?

It's cold in the morning and at night. Wear pants and a coat.

You can wear a long-sleeved T-shirt or one or two short sleeves during the day.

The weather will get colder every day. You don't need to bring summer clothes, but autumn clothes. What you need to prepare is a complete set of underwear with long trousers, because you will wear autumn trousers later.

There's no need to buy it home. It's best to go into battle lightly. Just buy it when you get to Harbin. You can buy clothes at that time according to the season. The price in Harbin is not very high, so it should be acceptable.

Many southerners are actually more frost-resistant than Harbin people. The cold in the north is dry, not wet, and the cold in the south is bleak. Winter in the north is better because of heating. So there is no need to prepare so many things, maybe you won't need them.