We travel to Xian from 9th-13th Mar, What type of cloths do we need to prepare?

Well, the lowest temperature will be 4-5C and the highest temperature will be about 22C. During these days, it will be cloudy and on March. 12, it may rain a little. Maybe simple rainy gear is needed. While as for the clothes, you can take long light sweater, a relatively thick jacket and jeans.