There you go. Take a close look at this proud man named Geronimo by the Mexicans. He's a good illustration and inspiration for desert clothing:



He's got a large neckerchief (thousands of uses). His garment at the groin can't be looser since he's wearing a handspun cotton loincloth or kilt. But he's also wearing leggings (thermal underwear).

Notice also his long thick Apache moccasins that help protect against rattlesnake bites and cactus thorns and is properly closed at the top as if he's wearing puttees to prevent sand from entering.

For those cold nights he would propably don an old fashion "poncho" over everything, the kind wore by Clint Eastwood in The Good, the Bad and the Ugly.

Frankie