Ni hao! Vova, 厚的裤子= fabric of this pants is thick We also say:厚裤子 the size is bigger than necessary ，Chinese say: 大一号的裤子 Hope that's helpful for you! Thanks ~

同意Zhang的释疑，另外的还有“厚被子/厚袜子/厚棉衣/厚手套/厚外套“等等，反义是”薄**“

слишком плотная ткань