Chinos fall under the middle of the dress spectrum. They come in twill cotton originated in China. Therefore, the fabric might shrink a little if you wash it. The amount of shrinkage depends on a few factors such as hot water washing, the drying method, and so on. Some manufacturers pre-wash the Chino pants material. This results in pre-washed cotton. Nevertheless, the shrinkage is unpredictable, so wash it, wear it and then alter it.