Hiii I'll be going to shanghai for around 1 month between March to April. Is it necessary to wear many layers? Like : 1st layer: thermal. 2nd layer: Tshirt. 3rd layer: Sweater. 4th layerz: Jacket. 5th layer: Windbreaker. (??) Becuz i'm afraid my luggage would be overweight if i bring too many clothes.