Many people assume that since Ladakh has scarce vegitation, it's okay to pack only a few tshirts. Although, they're comfortable to wear during daytime, the weather gets chilly after the sun sets. You'd require a fleece jacket and pull over. It is crucial that you have at least three layers of clothing. Packinga a few woolen clothes doesn't hurt as well. Since rain are frequent in the mountains, you should carry a raincot or a poncho as well.