It can be done. Exposure to the weather is less of a problem. A Stone Age nomadics instructor I know, who likes to sleep out in the winter, has a wife who complains that being in bed with him is like being next to a furnace. The body simply adjusts. In wintertime, where I am, sometimes I see cars off the road.
People get out of their cars dressed like it was summer.
Like most Americans, they are about as well adjusted to their environment as if they were astronauts on the moon. Look at old pictures of Indians, like Chief Joseph. He wore a capote made from a Hudson Bay blanket. Not much more. And he was out in the weather a lot.