I will travel next weekend. I checked that the weather was 5- 10 degrees. Is it not cold to wear a T-shirt and Nike sweater?

Cold! Really ~ they don't know anything about it. Ask them where they have played ~ who knows if it is cold or not ~ If you want to go to other places to play, you can wear it like this, but you'd better bring a thicker dress inside! Especially when it is cold in the morning and evening, sometimes people freeze to death in the morning and wear short sleeves at noon. It's much better to take a thick coat when it's cold than not to take it at all. Our family needs to take a thick coat when they go out to play on holidays. If you don't go to other places and play in your city, you don't have to ~